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Note 3 - Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash paid for:    
Interest $ 853 $ 37
Income taxes, net of refunds 2,308 3,167
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid $ 216 $ 527