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Note 9 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] $ in Thousands, $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 09, 2020 CAD ($)
--- | --- | --- | ---
Principal | $ 513,051 | $ 512,886 |
Unamortized discount/premium and issuance costs | (4,956) | (5,644) |
Long-term debt balance | 508,095 | 507,242 |
The 2028 Senior Notes [Member] |  |  |
Principal | 475,000 | 475,000 |
Unamortized discount/premium and issuance costs | (5,552) | (6,462) |
Long-term debt balance | 469,448 | 468,538 |
IQ Notes [Member] |  |  |
Principal | 38,051 | 37,886 |
Unamortized discount/premium and issuance costs | 596 | 818 |
Long-term debt balance | $ 38,647 | $ 38,704 | $ 48.2

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