Note 5 - Goodwill and Core Deposit Intangibles (Details Textual) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Jun. 01, 2021	May 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	May 01, 2019	Dec. 31, 2013	Dec. 31, 1996
Goodwill, Ending Balance	$ 135,830,000	$ 136,529,000			$ 12,513,000	$ 12,513,000	$ 12,513,000	$ 12,513,000
Kentucky Bancshares [Member]
Goodwill, Ending Balance	$ 123,000,000		$ 0	$ 123,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 4,403,000
Kentucky Bancshares [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 4,400,000
King Bancorp Inc. [Member]
Goodwill, Ending Balance									$ 12,000,000
King Bancorp Inc. [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									$ 1,500,000
Indiana Bank [Member] | Commercial Banking [Member]
Goodwill, Ending Balance											$ 682,000
THE BANCorp [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles										$ 2,500,000