Note 23 - Derivative Financial Instruments (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Jun. 30, 2017
First Interest Rate Swap [Member]
Derivative, Notional Amount				$ 50,000,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent, Total	$ (2,857,818)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent, Total	902,469
Second Interest Rate Swap [Member]
Derivative, Notional Amount			$ 10,300,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent, Total	(897,491)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent, Total	283,418
Interest Rate Swap [Member]
Derivative, Notional Amount	50,000,000
Derivative, Collateral, Obligation to Return Cash	$ 5,100,000	$ 1,900,000