Note 15 - Federal and State Income Taxes - Reconciliation of the Expected Federal Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal and State Income Taxes
Computed "expected" tax expense	$ 26,590	$ 23,845	$ 25,508
Tax exempt income, net	(13,823)	(10,689)	(7,537)
Bank-owned life insurance	(875)	(432)	(386)
State income taxes, net of federal benefit, current year	4,433	4,482	5,089
Change in unrecognized tax benefits	396	498	578
Intended liquidation of bank-owned life insurance	(247)	(1,181)
Tax credits			34
Tax Credits	(2,865)	(1,362)
Acquisition costs		276	95
Excess tax benefit on stock options exercised and restricted stock awards vested	(464)	(503)	(436)
Other	(83)	(451)	(383)
Federal and state income tax expense	$ 13,062	$ 14,483	$ 22,562
Computed "expected" tax expense (in percentage)	21.00%	21.00%	21.00%
Tax exempt income, net (in percentage)	(10.90%)	(9.40%)	(6.20%)
Bank-owned life insurance (in percentage)	(0.70%)	(0.40%)	(0.30%)
State income taxes, net of federal benefit, current year (in percentage)	3.50%	3.90%	4.20%
Change in unrecognized tax benefits (in percentage)	0.30%	0.40%	0.50%
Intended liquidation of bank-owned life insurance (in percentage)	(0.20%)	(1.00%)
Tax credits (in percentage)	(2.30%)	(1.20%)
Acquisition costs (in percentage)		0.20%	0.10%
Excess tax benefit on stock options exercised and restricted stock awards vested (in percentage)	(0.30%)	(0.40%)	(0.40%)
Other (in percentage)	(0.10%)	(0.40%)	(0.30%)
Federal and state income tax expense (in percentage)	10.30%	12.70%	18.60%