Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Long-Term Debt, Gross	$ 510,194	$ 513,051
Unamortized discount/premium and issuance costs	(4,449)	(4,956)
Long-term debt balance	505,745	508,095
The 2028 Senior Notes [Member]
Long-Term Debt, Gross	475,000	475,000
Unamortized discount/premium and issuance costs	(4,868)	(5,552)
Long-term debt balance	470,132	469,448
IQ Notes [Member]
Long-Term Debt, Gross	35,194	38,051
Unamortized discount/premium and issuance costs	419	596
Long-term debt balance	$ 35,613	$ 38,647