Note 7 - Debt, Credit Agreement and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	$ 510,643	$ 510,614
Unamortized discount/premium and issuance costs	(4,059)	(4,248)
Long-term debt balance	506,584	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	(4,415)	(4,640)
Long-term debt balance	470,585	470,360
IQ Notes [Member]
Line of Credit Facility [Line Items]
Long-Term Debt, Gross	35,643	35,614
Unamortized discount/premium and issuance costs	356	392
Long-term debt balance	$ 35,999	$ 36,006