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Note 16 - Income Tax - Provision for (Recovery of) Income Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current    
Current income tax expense (recovery) $ 53,059 $ 34,347
Deferred    
Deferred income tax expense (recovery) (17,194) (7,200)
Total 35,865 27,147
Canada Revenue Agency [Member]    
Current    
Canada, current income tax expense (recovery) 3,300 369
Deferred    
Canada, deferred income tax expense (recovery) 1,350 (1,620)
Internal Revenue Service (IRS) [Member]    
Current    
United States, current income tax expense (recovery) 49,759 33,978
Deferred    
United States, deferred income tax expense (recovery) $ (18,544) $ (5,580)