Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Commitments and Contingencies (Details Textual)

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Note 13 - Commitments and Contingencies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Leases, Rent Expense, Net, Total $ 706,080 $ 681,792 $ 1,391,757 $ 1,426,086