Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	Jun. 30, 2018	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 02, 2018
Goodwill, Ending Balance			$ 1,434,982	$ 1,434,982
Finite-Lived Intangible Assets, Net, Ending Balance			1,549,910	2,026,910
Cash Reserve Deposit Required and Made			0
Gain (Loss) on Derivative Instruments, Net, Pretax, Total		$ (2,600,000)	(2,580,000)	(0)	$ (0)
Cash, Uninsured Amount			38,000,000.0
Interest-bearing Deposits in Banks and Other Financial Institutions			122,464,075	142,056,538
Federal Reserve Bank [Member]
Interest-bearing Deposits in Banks and Other Financial Institutions			82,900,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Gain (Loss) on Derivative Instruments, Net, Pretax, Total			(2,600,000)
Hometown Bancshares, Inc. [Member]
Goodwill, Ending Balance			$ 1,434,982	1,434,982		$ 1,400,000
Hometown Bancshares, Inc. [Member] | Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	7 years		7 years
Finite-Lived Intangible Assets, Net, Ending Balance			$ 1,549,910	$ 2,026,910			$ 3,520,000