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Long-term investments (Details Textual)
¥ in Millions
1 Months Ended 7 Months Ended 12 Months Ended
Dec. 11, 2017
USD ($)
Dec. 11, 2017
CNY (¥)
Jun. 08, 2017
USD ($)
shares
Jun. 08, 2017
CNY (¥)
shares
May 05, 2017
USD ($)
May 05, 2017
CNY (¥)
Feb. 28, 2018
USD ($)
Jul. 27, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Apr. 28, 2018
USD ($)
Apr. 28, 2018
CNY (¥)
Mar. 01, 2018
USD ($)
Mar. 01, 2018
CNY (¥)
Feb. 28, 2018
CNY (¥)
Dec. 11, 2017
CNY (¥)
Equity Method Investments                               $ 700,000 ¥ 4.9    
Equity Method Investment, Ownership Percentage                   31.294%           49.00% 49.00%    
Income (Loss) from Equity Method Investments                 $ (140,132) $ 107,243                  
Sale of Stock, Consideration Received on Transaction         $ 9,200,000 ¥ 60.0                          
Disposal Group, Including Discontinued Operation, Additional Consideration $ 12,100,000                                   ¥ 78.9
Gain (Loss) on Sale of Investments                 0 1,677,367                  
Sale of Stock, Number of Shares Issued in Transaction | shares     25,145,834 25,145,834                              
Proceeds from Related Party Debt                 5,945,384 0                  
Deconsolidation, Gain (Loss), Amount                 0 6,004,008                  
Equity Method Investment, Additional Information             In addition, the Company agreed 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.                        
Shenzhen Vpower Innovative Technology Co Ltd [Member]                                      
Equity Method Investments             $ 700,000                     ¥ 4.9  
Equity Method Investment, Ownership Percentage             49.00%                     49.00%  
Xiamen Tungsten [Member]                                      
Sale of Stock, Consideration Received on Transaction   ¥ 92.8               14,300,000                  
Sale of Stock, Percentage of Ownership Interest Sold 55.294% 55.294%                                  
Proceeds from Related Party Debt $ 6,100,000 ¥ 40.0                                  
Deconsolidation, Gain (Loss), Amount                   6,004,008                  
Yipeng Energy Technology Co. Ltd [Member]                                      
Sale of Stock, Consideration Received on Transaction     $ 10,900,000 ¥ 71.0                              
Percentage Of Subsidiary Equity Interest Sold         20.00% 20.00%                          
Sale of Stock, Percentage of Ownership before Transaction         35.40% 35.40%                          
Sale of Stock, Percentage of Ownership after Transaction         4.654% 4.654%                          
V-Power [Member]                                      
Income (Loss) from Equity Method Investments                 123,628                    
Related Party Transaction, Due from (to) Related Party                 300,000   $ 300,000 ¥ 2.1 ¥ 2.1 $ 300,000 ¥ 2.1        
GZ Highpower [Member]                                      
Income (Loss) from Equity Method Investments                 $ 16,504                    
Yipeng [Member]                                      
Equity Method Investments                   $ 500,270                  
Income (Loss) from Equity Method Investments               $ 107,243