Non-financial institution borrowings (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Interest Expense, Debt	$ 547,317	$ 622,694
Repayments of Other Short-term Debt	1,507,068	3,857,910
Proceeds from Other Short-term Debt	$ 0	$ 10,386,681
Third Party Nonfinancial Institution [Member]
Debt Instrument, Interest Rate, Effective Percentage		5.655%
Repayments of Other Short-term Debt		$ 2,374,099
Proceeds from Other Short-term Debt		$ 1,483,812
Individual Lender [Member]
Debt Instrument, Interest Rate, Effective Percentage	5.66%	5.66%
Repayments of Other Short-term Debt		$ 1,483,811
Proceeds from Other Short-term Debt	$ 8,761,426	$ 8,902,869

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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