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Note 6 - Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance $ 847,197 $ 790,449 $ 729,030 $ 532,606 $ 501,658 $ 471,252 $ 729,030 $ 471,252
Other comprehensive income (loss) 9,541 3,009 10,203 17,916 (1,550) (2,514)    
Balance 878,110 847,197 790,449 703,313 532,606 501,658 878,110 703,313
AOCI Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Balance (13,633) (16,642) (26,845) (28,055) (26,505) (23,991) (26,845) (23,991)
Other comprehensive income (loss) before reclassification             28,478 17,265
Federal income tax (benefit) expense             (5,922) (3,626)
Other comprehensive income (loss) before reclassification, net of tax             22,556 13,639
Amounts reclassified from AOCI             249 270
Federal income tax (benefit) expense             (52) (57)
Amounts reclassified from AOCI, net of tax             197 213
Other comprehensive income (loss) 9,541 3,009 10,203 17,916 (1,550) (2,514) 22,753 13,852
Balance $ (4,092) $ (13,633) $ (16,642) $ (10,139) $ (28,055) $ (26,505) $ (4,092) $ (10,139)