Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Less: current debt	$ (35,384)	$ (33,617)
Senior Notes [Member]
Line of Credit Facility [Line Items]
Principal	549,358	531,525
Unamortized discount/premium and issuance costs	(2,334)	(2,724)
Total debt	547,024	528,801
Less: current debt	(35,384)	(33,617)
Long-term debt	511,640	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	(2,360)	(2,816)
Total debt	472,640	472,184
Less: current debt	0	0
Long-term debt	472,640	472,184
Senior Notes [Member] | IQ Notes [Member]
Line of Credit Facility [Line Items]
Principal	35,358	33,525
Unamortized discount/premium and issuance costs	26	92
Total debt	35,384	33,617
Less: current debt	(35,384)	(33,617)
Long-term debt	0	0
Senior Notes [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Principal	39,000	23,000
Unamortized discount/premium and issuance costs	0	0
Total debt	39,000	23,000
Less: current debt	0	0
Long-term debt	$ 39,000	$ 23,000