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Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Beginning Balance $ 384,754 $ 394,169
Other comprehensive (loss) (6,706) (47,941)
Balance at end of period 421,334 367,845
AOCI Attributable to Parent [Member]    
Beginning Balance (36,515) 5,312
Other comprehensive (loss) before reclassification (8,453) (60,983)
Federal income tax (benefit) expense 1,775 12,806
Other comprehensive (loss) before reclassification, net of tax (6,678) (48,177)
Amounts reclassified from AOCI (36) 299
Federal income tax expense (benefit) 8 (63)
Amounts reclassified from AOCI, net of tax (28) 236
Other comprehensive (loss) (6,706) (47,941)
Balance at end of period $ (43,221) $ (42,629)