Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Current debt	$ 35,874	$ 0
Senior Notes [Member]
Line of Credit Facility [Line Items]
Principal	523,735	639,473
Unamortized discount/premium and issuance costs	(2,905)	(3,473)
Long-term debt balance	484,956	636,000
Current debt	35,874
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	(3,044)	(3,730)
Long-term debt balance	471,956	471,270
Current debt	0
Senior Notes [Member] | IQ Notes [Member]
Line of Credit Facility [Line Items]
Principal	35,735	36,473
Unamortized discount/premium and issuance costs	139	257
Long-term debt balance	0	36,730
Current debt	35,874
Senior Notes [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Principal	13,000	128,000
Unamortized discount/premium and issuance costs	0	0
Long-term debt balance	13,000	$ 128,000
Current debt	$ 0