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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Balance at March 31, 2023 and 2022 $ 873,413 $ 689,742 $ 865,990 $ 701,769
Unrealized loss on note receivable (184) (846) (316) (846)
Balance at June 30, 2023 and 2022 892,527 841,647 892,527 841,647
AOCI Attributable to Parent [Member]        
Balance at March 31, 2023 and 2022 8,254 2,471 8,576 2,668
Unrealized loss on note receivable (184) (846) (316) (846)
Balance at June 30, 2023 and 2022 4,566 1,763 4,566 1,763
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Before reclassifications $ (3,504) $ 138 $ (3,694) $ (59)