Annual report pursuant to Section 13 and 15(d)

Long-term investment (Details Textual)

v3.7.0.1
Long-term investment (Details Textual)
1 Months Ended 12 Months Ended
Apr. 30, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 01, 2016
USD ($)
Apr. 01, 2016
CNY (¥)
Income (Loss) from Equity Method Investments   $ 351,755 $ 0    
Yipeng Energy Technology Co. Ltd [Member]          
Business Acquisition, Percentage of Voting Interests Acquired       5.00% 5.00%
Cost Method Investments       $ 719,445 ¥ 5,000,000
Equity Method Investment, Description of Principal Activities the Company will purchase up to 50% of Yipengs equity on two closings: (1) on August 10, 2016, in addition to the existing 5% shares of Yipeng, the Company agreed to pay approximately $2.2 million in cash and transfer equipment worth approximately $6.5 million in exchange for the purchase of 30.4% of the shares of Yipeng, and (2) prior to November 5, 2016, provided that Yipeng has been approved to be listed in the catalogue of Industrial Standards of Auto Mobile Power Battery Cell (the Catalogue) prior to October 31, 2016, the Company will pay approximately $2.8 million in cash and transfer equipment worth approximately $5.0 million in exchange for an additional 14.6% of the shares of Yipeng. The Company also has the right to purchase in the future an additional 1% of the shares from Yipengs founding shareholders at a price of approximately $0.4 million which would result in an aggregate ownership of 51% of Yipeng.        
Equity Method Investments   $ 9,400,000      
Equity Method Investment, Ownership Percentage   35.40%