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Note 11 - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance at December 31 $ 1,016,410 $ 1,144,923 $ 1,021,944
Balance at December 31 823,272 1,016,410 1,144,923
AOCI Attributable to Parent [Member]      
Balance at December 31 (236) 2,194 (147)
Reclasses from OCI to net income 0 0 (1,132)
Balance at December 31 (804) (236) 2,194
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Before reclassifications (568) (2,430) 4,133
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]      
Before reclassifications $ 0 $ 0 $ (660)