Long-term investments (Details Textual) ¥ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Feb. 28, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 CNY (¥)	Feb. 28, 2018 CNY (¥)	Dec. 31, 2017 USD ($)
Income (Loss) from Equity Method Investments			$ 160,070	$ (41,607)	$ 316,320	$ 105,325
Equity Method Investment, Additional Information		In addition, the Company agrees to transfer the 15% of original equity interest of V-power to the Founder Team as compensation under voluntary assignment as any of the following requirements met: 1. annual sales revenue higher or equal to RMB30 million before the first capital increase of V-power; 2. valuation of V-power higher or equal to RMB30 million before equity issuance.
Minimum [Member]
Cost Method Investments Ownership Percentage									35.40%
Maximum [Member]
Cost Method Investments Ownership Percentage									4.654%
Shenzhen V-power Innovative Technology Co Ltd [Member]
Equity Method Investments		$ 700,000						¥ 4.9
Equity Method Investment, Ownership Percentage		49.00%						49.00%
GZ Highpower [Member]
Equity Method Investments	[1]		$ 8,294,952		$ 8,294,952				$ 8,102,520
Equity Method Investment, Ownership Percentage	[1]		31.294%		31.294%		31.294%		31.294%
Income (Loss) from Equity Method Investments			$ 179,964		$ 336,214
Yipeng Energy Technology Co. Ltd [Member]
Income (Loss) from Equity Method Investments				$ 41,607
V Power [Member]
Income (Loss) from Equity Method Investments			19,894		19,894
Related Party Transaction, Due from (to) Related Party			$ 300,000		$ 300,000		¥ 2.1

[1] Investment in GZ Highpower On December 21, 2017, after the completion of the capital increase to GZ Highpower by other shareholders, the Company lost the controlling power over GZ Highpower and deconsolidated GZ Highpower. Thereafter, the investment was recorded under the equity method. The equity in earnings of investee was $179,964 and $336,214 for the three and six months ended June 30, 2018.