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Note 2 - Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash paid for:      
Interest $ 47 $ 66 $ 86
Income taxes, net of refunds 3,878 3,562 1,459
Non-cash investing and financing activities:      
Capital additions accrued but not yet paid $ 85 $ 87 $ 579