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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
(Losses) gains recognized         $ 0 $ 0 $ 0 $ 385 $ 0 $ 385 $ (43)
Income before income taxes $ 13,592 $ 16,424 $ 17,480 $ 19,032 14,939 10,598 10,508 10,067 66,528 46,112 49,796
Income tax benefit 3,037 3,816 4,077 4,430 3,389 2,332 2,270 2,195 15,360 10,186 10,994
Net income $ 10,555 $ 12,608 $ 13,403 $ 14,602 $ 11,550 $ 8,266 $ 8,238 $ 7,872 51,168 35,926 38,802
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
(Losses) gains recognized                 0 (385) 43
Income tax benefit                 0 81 (9)
Net income                 308 0 254
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                      
Income before income taxes                 0 (385) 43
Income tax benefit                 (80) (82) (58)
Net income                 0 (304) 34
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other operating expense                 124 201 257
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other operating expense                 264 185 21
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Income before income taxes                 388 386 278
Net income                 $ 308 $ 304 $ 220