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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Balance at June 30, 2023 and 2022 $ 892,527 $ 841,647 $ 865,990 $ 701,769
Unrealized loss on note receivable (153) (429) (469) (1,275)
Balance at September 30, 2023 and 2022 1,031,524 847,099 1,031,524 847,099
AOCI Attributable to Parent [Member]        
Balance at June 30, 2023 and 2022 4,566 1,763 8,576 2,668
Unrealized loss on note receivable (153) (429) (469) (1,275)
Balance at September 30, 2023 and 2022 4,413 1,474 4,413 1,474
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Before reclassifications $ 0 $ 140 $ (3,694) $ 81