Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Principal	$ 510,600	$ 511,473
Unamortized discount/premium and issuance costs	(3,290)	(3,473)
Long-term debt balance	507,310	508,000
The 2028 Senior Notes [Member]
Line of Credit Facility [Line Items]
Principal	475,000	475,000
Unamortized discount/premium and issuance costs	(3,501)	(3,730)
Long-term debt balance	471,499	471,270
IQ Notes [Member]
Line of Credit Facility [Line Items]
Principal	35,600	36,473
Unamortized discount/premium and issuance costs	211	257
Long-term debt balance	$ 35,811	$ 36,730