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Note 15 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loss recognized                 $ 21 $ 0 $ 0
Income before income taxes $ 14,716 $ 18,947 $ 12,871 $ 15,440 $ 15,659 $ 17,462 $ 14,636 $ 12,400 61,974 60,157 66,528
Income tax benefit 2,932 4,307 3,057 3,658 3,076 4,111 3,423 2,885 13,954 13,495 15,360
Net income $ 11,784 $ 14,640 $ 9,814 $ 11,782 $ 12,583 $ 13,351 $ 11,213 $ 9,515 48,020 46,662 51,168
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Income tax benefit                 (5) 0 0
Net income                 47 106 308
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]                      
Income before income taxes                 21 0 0
Income tax benefit                 (7) (29) (80)
Net income                 16 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other operating expense                 0 0 124
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other operating expense                 38 135 264
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Income before income taxes                 38 135 388
Net income                 $ 31 $ 106 $ 308