Note 8 - Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance	$ 163,016	$ 143,523	$ 158,416	$ 156,729
Balance	162,725	162,790	162,725	162,790
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(22,525)	(9,080)	(26,357)	3,493
Other comprehensive income (loss), before reclassifications and income taxes	(1,624)	(13,581)	3,353	(30,648)
Amounts reclassified from accumulated other comprehensive income (loss), before income taxes	(2)	6	222	6
Income tax provision (benefit)	428	3,574	(941)	8,068
Total other comprehensive income (loss)	(1,198)	(10,001)	2,634	(22,574)
Balance	$ (23,723)	$ (19,081)	$ (23,723)	$ (19,081)