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Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Principal | $ 513,918 | $ 512,886
Unamortized discount/premium and issuance costs | (5,307) | (5,644)
Long-term debt balance | 508,611 | 507,242
The 2028 Senior Notes [Member] |  |
Principal | 475,000 | 475,000
Unamortized discount/premium and issuance costs | (6,007) | (6,462)
Long-term debt balance | 468,993 | 468,538
IQ Notes [Member] |  |
Principal | 38,918 | 37,886
Unamortized discount/premium and issuance costs | 700 | 818
Long-term debt balance | $ 39,618 | $ 38,704

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