Note 21 - Derivative Financial Instruments (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 791,465	$ 632,990
Interest Rate Swap [Member]
Derivative, Notional Amount	50,000,000			$ 50,000,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	947,296
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	324,242
Derivative, Collateral, Obligation to Return Cash	$ 1,470,000