Note 14 - Derivative Financial Instruments - Derivative Instruments (Details) - Interest Expense [Member] - Designated as Hedging Instrument [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Rate Swap [Member]
Derivative gain (loss)	$ 228,899	$ (33,424)	$ 391,277	$ (162,517)
Interest Rate Swap - Subordinated Debentures [Member]
Derivative gain (loss)	$ 61,211	$ 7,268	$ 121,242	$ 8,569