Note 16 - Off-balance Sheet Activities - Off-balance Sheet Financial Instruments Whose Contractual Amounts Represents Credit Risk (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Commitments to Extend Credit [Member]
Off-balance sheet financial instruments outstanding	$ 654,436,000	$ 503,272,000
Standby Letters of Credit [Member]
Off-balance sheet financial instruments outstanding	10,201,000	17,355,000
Mortgage Loan Rate Lock Commitments [Member]
Off-balance sheet financial instruments outstanding	$ 10,891,000	$ 26,883,000