Note 21 - Derivative Financial Instruments (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Jun. 30, 2017
Debt Securities, Available-for-sale, Gain (Loss), Total	$ 2,700,000	$ 2,740,341	$ 461,029	$ 89,564
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	(2,600,000)	(2,580,000)	(0)	(0)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(2,600,000)	(2,580,000)	(0)	$ (0)
Federal Home Loan Bank Advances [Member]
Repayments of Secured Debt	50,000,000
First Interest Rate Swap [Member]
Derivative, Notional Amount						$ 50,000,000
Derivative, Fixed Interest Rate						2.12%
Derivative, Investment Proceeds Used to Terminate Derivative	43,000,000
Derivative, Excess Cash Used to Terminate Derivative	$ 7,000,000
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		443,495
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent, Total		140,051
Interest Rate Swap [Member]
Derivative, Notional Amount		$ 50,000,000
Derivative, Fixed Interest Rate		2.12%
Derivative, Collateral, Obligation to Return Cash		$ 580,000	5,100,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative, Net Hedge Ineffectiveness Gain (Loss)		$ 0	$ 0