Note 13 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income tax expense (benefit), effective income tax rate reconciliation, Amount
Income taxes computed at the federal statutory rate	$ 3,134	$ 21,938	$ 30,701
State taxes, net of federal benefits	214	1,210	1,422
State tax rate changes, net of federal benefits	(166)	350	(546)
Percentage depletion	(2,410)	(1,717)	(3,314)
Stock-based compensation	(3,299)	(3,395)	(1,499)
162(m) compensation limitation	6,172	5,716	3,481
Foreign-derived intangible income deduction		(1,475)
Other, net	83	(277)	(92)
Provision for income tax expense (benefit), net	$ 3,728	$ 22,350	$ 30,153