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Note 5 - 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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Balance at June 30, 2024 and 2023	$ 1,078,987	$ 892,527	$ 1,037,697	$ 865,990
Unrealized gain (loss) on note receivable	130	(153)	283	(469)
Balance at September 30, 2024 and 2023	1,113,840	1,031,524	1,113,840	1,031,524
AOCI Attributable to Parent [Member]
Balance at June 30, 2024 and 2023	5,062	4,566	5,266	8,576
Unrealized gain (loss) on note receivable	130	(153)	283	(469)
Balance at September 30, 2024 and 2023	4,592	4,413	4,592	4,413
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before reclassifications	$ (600)	$ 0	$ (957)	$ (3,694)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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