Note 3 - Acquisition (Details Textual) - USD ($)	Apr. 02, 2018	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill, Ending Balance		$ 1,434,982	$ 1,434,982
Hometown Bancshares, Inc. [Member]
Business Acquisition, Share Price (in dollars per share)	$ 20.00
Business Combination, Consideration Transferred, Total	$ 4,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	178,800,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Net	143,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	161,200,000
Goodwill, Ending Balance	$ 1,400,000			$ 1,400,000