Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Less: current debt	$ (33,612)	$ (33,617)
Senior Notes [Member]
Line of Credit Facility [Line Items]
Principal	551,554	531,525
Unamortized discount/premium and issuance costs	(2,530)	(2,724)
Total debt	549,024	528,801
Less: current debt	(33,612)	(33,617)
Long-term debt	515,412	495,184
Senior Notes [Member] | The 2028 Senior Notes [Member]
Line of Credit Facility [Line Items]
Principal	475,000	475,000
Unamortized discount/premium and issuance costs	(2,588)	(2,816)
Total debt	472,412	472,184
Less: current debt	0	0
Long-term debt	472,412	472,184
Senior Notes [Member] | IQ Notes [Member]
Line of Credit Facility [Line Items]
Principal	33,554	33,525
Unamortized discount/premium and issuance costs	58	92
Total debt	33,612	33,617
Less: current debt	(33,612)	(33,617)
Long-term debt	0	0
Senior Notes [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Principal	43,000	23,000
Unamortized discount/premium and issuance costs	0	0
Total debt	43,000	23,000
Less: current debt	0	0
Long-term debt	$ 43,000	$ 23,000