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Note 3 - Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash paid for:    
Interest $ 47 $ 114
Income taxes, net of refunds (156)
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid 108 197
Recognition of lease asset and liability (ASC 842) $ 3,831