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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Balance $ 841,647 $ 759,738 $ 701,769 $ 823,272
Unrealized loss on note receivable (429) 0 (1,275) 0
Balance 847,099 734,612 847,099 734,612
AOCI Attributable to Parent [Member]        
Balance 1,763 (1,082) 2,668 (804)
Unrealized loss on note receivable (429) 0 (1,275) 0
Balance 1,474 (1,289) 1,474 (1,289)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Before reclassifications $ 140 $ (207) $ 81 $ (485)