Annual report pursuant to Section 13 and 15(d)

Short-term loans (Details Textual)

v3.7.0.1
Short-term loans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Pledged Assets Not Separately Reported Property Plant And Equipment $ 11,854,452  
Interest Expense, Short-term Borrowings, Total 925,115 $ 739,662
Restricted Cash and Cash Equivalents 11,213,640 11,656,204
Bank Time Deposits [Member]    
Short-term Debt [Line Items]    
Restricted Cash and Cash Equivalents $ 151,083 $ 263,973
Minimum [Member]    
Short-term Debt [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.35%  
Maximum [Member]    
Short-term Debt [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.87%  
Short-term Debt [Member]    
Short-term Debt [Line Items]    
Guarantor Obligations, Liquidation Proceeds, Monetary Amount $ 3,622,435  
Short-term Debt, Weighted Average Interest Rate 5.18% 5.51%