Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details)

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 2,532,536	$ 3,754,762
Less - accumulated amortization	(960,451)	(860,772)
Intangible assets, net	1,572,085	2,893,990
Unfavorable contract liability	4,689,025	7,912,275
Less - accumulated amortization	(2,044,367)	(1,619,676)
Unfavorable contract liability, net	2,644,658	6,292,599
Product Certifications
Finite-Lived Intangible Assets [Line Items]
Intangible assets	726,159	726,159
Less - accumulated amortization	(386,344)	(345,658)
Intangible assets, net	339,815	380,501
Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets	971,830	910,569
Less - accumulated amortization	(202,497)	(188,239)
Intangible assets, net	769,333	722,330
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(104,000)	(92,000)
Intangible assets, net	136,000	148,000
Favorable contract asset
Finite-Lived Intangible Assets [Line Items]
Intangible assets	274,858	1,561,739
Less - accumulated amortization	(262,059)	(232,099)
Intangible assets, net	12,799	1,329,640
TTcogen Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets	29,607	0
Less - accumulated amortization	(5,551)	0
Intangible assets, net	24,056	0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets	26,146	22,752
Less - accumulated amortization	0	0
Intangible assets, net	26,146	22,752
In Process R&D
Finite-Lived Intangible Assets [Line Items]
Intangible assets	263,936	263,936
Less - accumulated amortization	0	0
Intangible assets, net	$ 263,936	$ 263,936