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Note 16 - Income Tax - Earning Before Income Tax by Jurisdiction (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings before income tax $ 145,455 $ (200,484)
Canada Revenue Agency [Member] | Foreign Tax Authority [Member]    
Earnings before income tax 19,166 (323,100)
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]    
Earnings before income tax $ 126,289 $ 122,616