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Note 3 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance $ 404,482 $ 386,803 $ 357,989
Other comprehensive income (loss), net of tax 1,491 (1,646) 1,748
Balance 436,714 404,482 386,803
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]      
Balance 1,224 822 (545)
Change in unrealized gains during the period (1,854) 549 1,610
Net losses reclassified into income during the period 22 (25) 0
Income tax provision 423 (122) (243)
Other comprehensive income (loss), net of tax (1,409) 402 1,367
Balance (185) 1,224 822
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Balance (1,708) 340 (41)
Change in unrealized gains during the period 2,837 (2,099) 651
Net losses reclassified into income during the period 933 (564) (169)
Income tax provision (870) 615 (101)
Other comprehensive income (loss), net of tax 2,900 (2,048) 381
Balance 1,192 (1,708) 340
AOCI Attributable to Parent [Member]      
Balance (484) 1,162 (586)
Change in unrealized gains during the period 983 (1,550) 2,261
Net losses reclassified into income during the period 955 (589) (169)
Income tax provision (447) 493 (344)
Other comprehensive income (loss), net of tax 1,491 (1,646) 1,748
Balance $ 1,007 $ (484) $ 1,162