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Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Beginning Balance $ 471,252 $ 384,754
Other comprehensive (loss) income (2,514) 5,474
Balance at end of period 501,658 404,649
AOCI Attributable to Parent [Member]    
Beginning Balance (23,991) (36,515)
Other comprehensive (loss) income before reclassification (3,185) 6,956
Federal income tax expense (benefit) 669 (1,460)
Other comprehensive (loss) income before reclassification, net of tax (2,516) 5,496
Amounts reclassified from AOCI 2 (28)
Federal income tax expense 0 6
Amounts reclassified from AOCI, net of tax 2 (22)
Other comprehensive (loss) income (2,514) 5,474
Balance at end of period $ (26,505) $ (31,041)