Quarterly report pursuant to Section 13 or 15(d)

Short-term loans (Details Textual)

v3.7.0.1
Short-term loans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Short-term Debt [Line Items]          
Pledged Assets Not Separately Reported Property Plant And Equipment $ 11,995,138   $ 11,995,138   $ 11,854,452
Interest Expense, Short-term Borrowings, Total 277,319 $ 215,485 537,156 $ 422,593  
Bank Time Deposits [Member]          
Short-term Debt [Line Items]          
Restricted Cash and Cash Equivalents $ 154,931   $ 154,931   $ 151,083
Minimum [Member]          
Short-term Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.35%   4.35%   4.35%
Maximum [Member]          
Short-term Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.655%   5.655%   5.87%
Short-term Debt [Member]          
Short-term Debt [Line Items]          
Guarantor Obligations, Liquidation Proceeds, Monetary Amount     $ 3,670,645   $ 3,622,435