Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018	Apr. 02, 2018
Goodwill, Ending Balance	$ 1,434,982		$ 1,434,982
Finite-Lived Intangible Assets, Net, Ending Balance	2,503,910		$ 2,980,910
Cash Reserve Deposit Required and Made	$ 1,920,000
Capital Conservation Buffer	2.50%		1.875%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		30,000
Hometown Bancshares, Inc. [Member]
Goodwill, Ending Balance	$ 1,434,982		$ 1,434,982	$ 1,435,000
Hometown Bancshares, Inc. [Member] | Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life	7 years
Finite-Lived Intangible Assets, Net, Ending Balance	$ 2,503,910		$ 2,980,910	$ 3,520,000