Note 9 - Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) - Interest Rate Swap [Member] - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Notional Amount	$ 548,000,000	$ 402,000,000
Other Assets [Member]
Notional Amount	548,224,000	401,572,000
Derivative Assets Interest rate swaps	26,880,000	25,697,000
Other Liabilities [Member]
Notional Amount	548,224,000	401,572,000
Derivative Liabilities Interest rate swaps	$ 27,190,000	$ 25,900,000