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15. Warrants (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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| Common stock warrants outstanding |
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| Exercise Price Minimum |
$ 0.50MEEC_ExercisePriceMinimum
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| Exercise Price Maximum |
$ 3.30MEEC_ExercisePriceMaximum
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| Number outstanding |
20,648,294MEEC_NumberOutstanding
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| Weighted Average Remaining Contractual Life (years) |
4 years 3 months 29 days
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| Number Exercisable |
20,639,412us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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385,458us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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| Weighted Average Exercise Price |
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$ 10.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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| Warrant [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 3.30MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
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| Number outstanding |
11,364MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
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| Weighted Average Remaining Contractual Life (years) |
1 year 4 months 10 days
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| Weighted Average Exercise Price |
$ 3.30MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
|
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| Number Exercisable |
11,364us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
|
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| Weighted Average Exercise Price |
$ 3.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
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| Warrant One [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 1.25MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantOneMember
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| Number outstanding |
32,101MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantOneMember
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| Weighted Average Remaining Contractual Life (years) |
1 year 1 month 24 days
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| Weighted Average Exercise Price |
$ 1.25MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantOneMember
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| Number Exercisable |
32,101us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantOneMember
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| Weighted Average Exercise Price |
$ 1.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantOneMember
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| Warrant Two [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 1.00MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantTwoMember
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| Number outstanding |
24,000MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantTwoMember
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| Weighted Average Remaining Contractual Life (years) |
1 year 9 months 26 days
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| Weighted Average Exercise Price |
$ 1.00MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantTwoMember
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| Number Exercisable |
24,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantTwoMember
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| Weighted Average Exercise Price |
$ 1.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantTwoMember
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| Warrant Three [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 0.88MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantThreeMember
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| Number outstanding |
1,303,300MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantThreeMember
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| Weighted Average Remaining Contractual Life (years) |
4 years 4 months 10 days
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| Weighted Average Exercise Price |
$ 0.88MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantThreeMember
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| Number Exercisable |
1,303,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantThreeMember
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| Weighted Average Exercise Price |
$ 0.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantThreeMember
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| Warrant Four [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 0.84MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFourMember
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| Number outstanding |
959,508MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFourMember
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| Weighted Average Remaining Contractual Life (years) |
4 years 7 months 13 days
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| Weighted Average Exercise Price |
$ 0.84MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFourMember
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| Number Exercisable |
950,626us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFourMember
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| Weighted Average Exercise Price |
$ 0.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFourMember
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| Warrant Five [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 0.75MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFiveMember
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| Number outstanding |
435,271MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFiveMember
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| Weighted Average Remaining Contractual Life (years) |
6 months 11 days
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| Weighted Average Exercise Price |
$ 0.75MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFiveMember
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| Number Exercisable |
435,271us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFiveMember
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| Weighted Average Exercise Price |
$ 0.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantFiveMember
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| Warrant Six [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 0.67MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSixMember
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| Number outstanding |
3,805,000MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSixMember
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| Weighted Average Remaining Contractual Life (years) |
3 years 9 months 7 days
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| Weighted Average Exercise Price |
$ 0.67MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSixMember
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| Number Exercisable |
3,805,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSixMember
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| Weighted Average Exercise Price |
$ 0.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSixMember
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| Warrant Seven [Member] |
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| Common stock warrants outstanding |
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| Exercise Price |
$ 0.50MEEC_ExercisePriceWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSevenMember
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| Number outstanding |
14,077,750MEEC_NumberOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSevenMember
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| Weighted Average Remaining Contractual Life (years) |
4 years 7 months 2 days
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| Weighted Average Exercise Price |
$ 0.50MEEC_WeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSevenMember
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| Number Exercisable |
14,077,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSevenMember
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| Weighted Average Exercise Price |
$ 0.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= MEEC_WarrantSevenMember
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