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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Balance at June 30, 2025 and 2024	$ 1,136,227	$ 1,078,987	$ 1,111,185	$ 1,037,697
Unrealized gain on note receivable	0	130	0	283
Balance	1,139,024	1,113,840	1,139,024	1,113,840
AOCI Attributable to Parent [Member]
Balance at June 30, 2025 and 2024	7,273	5,062	6,060	5,266
Unrealized gain on note receivable	0	130	0	283
Balance	7,894	4,592	7,894	4,592
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before reclassifications	$ 621	$ (600)	$ 1,834	$ (957)

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