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Note 12 - Income Tax - Earning Before Income Tax by Jurisdiction (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Earnings before income tax $ 81,630 $ 61,610
Canada Revenue Agency [Member] | Foreign Tax Authority [Member]    
Earnings before income tax 16,989 8,590
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]    
Earnings before income tax $ 64,641 $ 53,020