Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	$ 510,677	$ 510,614
Unamortized discount/premium and issuance costs	(3,674)	(4,248)
Long-term debt balance	507,003	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	3,958	(4,640)
Long-term debt balance	471,042	470,360
IQ Notes [Member]
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	35,677	35,614
Unamortized discount/premium and issuance costs	284	392
Long-term debt balance	$ 35,961	$ 36,006