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Note 3 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Balance $ 175,887 $ 175,243 $ 162,950 $ 211,729
Other comprehensive income (loss), net of tax (2,330) (18,423) 5,884 (61,099)
Balance 177,744 162,619 177,744 162,619
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (45,862) (42,497) (53,624) 179
Other comprehensive income before reclassifications, net of tax (2,779) 6 4,982 (42,670)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 1 0
Other comprehensive income (loss), net of tax (2,779) 6 4,983 (42,670)
Balance (48,641) (42,491) (48,641) (42,491)
AOCI, Gain (Loss), Debt Securities, Securities Transferred To Held-to-maturity [Member]        
Balance (17,076) 0 (17,528) 0
Other comprehensive income before reclassifications, net of tax 449 (18,429) 901 (18,429)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 0 0
Other comprehensive income (loss), net of tax 449 (18,429) 901 (18,429)
Balance (16,627) (18,429) (16,627) (18,429)
AOCI Attributable to Parent [Member]        
Balance (62,938) (42,497) (71,152) 179
Other comprehensive income before reclassifications, net of tax (2,330) (18,423) 5,883 (61,099)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 1 0
Other comprehensive income (loss), net of tax (2,330) (18,423) 5,884 (61,099)
Balance $ (65,268) $ (60,920) $ (65,268) $ (60,920)