Note 9 - Fair Value Measurement - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment securities	$ 484,416	$ 444,703
Reported Value Measurement [Member]
Cash and cash equivalents	105,676	183,426
Investment securities	484,416	444,703
Loans, net	906,022	903,968
FHLB stock	4,964	4,964
FRB Stock	1,366	1,364
Accrued interest receivable	7,329	7,433
Deposits	1,406,745	1,457,809
Repurchase agreements	16,914	18,624
Note Payable	10,000
Accrued interest payable	87	81
Loans held for sale		2,301
Junior subordinated deferrable interest debentures		10,310
Reported Value Measurement [Member] | Interest Rate Swap [Member]
Interest rate swaps		2,002
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	105,676	183,426
Investment securities	484,416	444,703
Loans, net	888,286	884,814
Accrued interest receivable	7,329	7,433
Deposits	1,407,184	1,458,250
Repurchase agreements	16,914	18,624
Note Payable	8,642
Accrued interest payable	87	81
Loans held for sale		2,301
Junior subordinated deferrable interest debentures		7,770
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]
Interest rate swaps		2,002
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	105,676	183,426
Accrued interest receivable	86	63
Deposits	1,357,735	1,408,623
Note Payable	0
Accrued interest payable	24	16
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities	484,416	444,703
Accrued interest receivable	2,673	2,309
Deposits	49,449	49,627
Repurchase agreements	16,914	18,624
Note Payable	0
Accrued interest payable	50	40
Loans held for sale		2,301
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Interest rate swaps		2,002
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Loans, net	888,286	884,814
Accrued interest receivable	4,570	5,061
Note Payable	8,642
Accrued interest payable	$ 13	25
Junior subordinated deferrable interest debentures		$ 7,770