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Note 7 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] $ in Thousands, $ in Millions | Dec. 31, 2020 USD ($) | Jul. 09, 2020 CAD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Principal | $ 512,886 |  |
Unamortized discount/premium and issuance costs | (5,644) |  |
Long-term debt balance | 507,242 |  |
The 2028 Senior Notes [Member] |  |  |
Principal | 475,000 |  |
Unamortized discount/premium and issuance costs | (6,462) |  |
Long-term debt balance | 468,538 |  |
IQ Notes [Member] |  |  |
Principal | 37,886 |  |
Unamortized discount/premium and issuance costs | 818 |  |
Long-term debt balance | $ 38,704 | $ 48.2 |
The 2021 Senior Notes [Member] |  |  |
Principal |  |  | $ 506,500
Unamortized discount/premium and issuance costs |  |  | (1,771)
Long-term debt balance |  |  | $ 504,729

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