Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Cash and cash equivalents		$ 187,669	$ 104,789
Loans, net		3,347,312	3,088,344
Mortgage servicing rights		1,188	1,065
Deposits		4,162,918	3,892,705
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	[1]	187,669	104,789
Loans, net	[1]	3,202,440	2,992,161
Mortgage servicing rights		1,526	1,252
Deposits	[1]	3,629,530	3,210,581
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents		187,669	104,789
Loans, net		0	0
Mortgage servicing rights		0
Deposits		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents		0	0
Loans, net		0	0
Mortgage servicing rights		1,526	1,252
Deposits		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents		0	0
Loans, net		3,202,440	2,992,161
Mortgage servicing rights		0
Deposits		$ 3,629,530	$ 3,210,581

[1] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.