Note 10 - Changes in Accumulated Other Comprehensive (Loss) Income by Component (1) - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance		$ 233,141	$ 320,441	$ 324,242	$ 308,113
Unrealized loss on securities		(45,243)	(3,103)	(143,249)	(4,266)
Total other comprehensive income (loss)		(45,110)	(2,730)	(142,768)	(2,775)
Balance		189,458	323,513	189,458	323,513
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	[1]	(106,668)	(177)	(8,662)	985
Unrealized loss on securities	[1]	(45,277)	(3,104)	(143,283)	(4,265)
Amounts reclassified from accumulated other comprehensive (loss) income to net income (2)	[1]	34	0	34	(1)
Total other comprehensive income (loss)	[1]	(45,243)	(3,104)	(143,249)	(4,266)
Total change in accumulated other comprehensive (loss) income	[1]	(45,243)	(3,104)	(143,249)	(4,266)
Balance	[1]	(151,911)	(3,281)	(151,911)	(3,281)
Accumulated Net Investment Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity [Member]
Balance	[1]	(1,664)	(2,697)	(2,012)	(3,814)
Unrealized loss on securities	[1]	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income to net income (2)	[1]	133	374	481	1,491
Total other comprehensive income (loss)	[1]	133	374	481	1,491
Total change in accumulated other comprehensive (loss) income	[1]	133	374	481	1,491
Balance	[1]	(1,531)	(2,323)	(1,531)	(2,323)
AOCI Attributable to Parent [Member]
Balance	[1]	(108,332)	(2,874)	(10,674)	(2,829)
Unrealized loss on securities	[1]	(45,277)	(3,104)	(143,283)	(4,265)
Amounts reclassified from accumulated other comprehensive (loss) income to net income (2)	[1]	167	374	515	1,490
Total other comprehensive income (loss)	[1]	(45,110)	(2,730)	(142,768)	(2,775)
Total change in accumulated other comprehensive (loss) income	[1]	(45,110)	(2,730)	(142,768)	(2,775)
Balance	[1]	$ (153,442)	$ (5,604)	$ (153,442)	$ (5,604)

[1] All amounts are net of tax. Amounts in parentheses indicate reductions to other comprehensive income.