Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Principal	$ 512,433	$ 513,051
Unamortized discount/premium and issuance costs	(4,592)	(4,956)
Long-term debt balance	507,841	508,095
The 2028 Senior Notes [Member]
Principal	475,000	475,000
Unamortized discount/premium and issuance costs	(5,096)	(5,552)
Long-term debt balance	469,904	469,448
IQ Notes [Member]
Principal	37,433	38,051
Unamortized discount/premium and issuance costs	504	596
Long-term debt balance	$ 37,937	$ 38,647

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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