Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	$ 511,434	$ 510,614
Unamortized discount/premium and issuance costs	(3,854)	(4,248)
Long-term debt balance	507,580	506,366
The 2028 Senior Notes [Member]
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	475,000	475,000
Unamortized discount/premium and issuance costs	(4,186)	(4,640)
Long-term debt balance	470,814	470,360
IQ Notes [Member]
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	36,434	35,614
Unamortized discount/premium and issuance costs	332	392
Long-term debt balance	$ 36,766	$ 36,006