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Note 3 - Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash paid for:    
Interest $ 40 $ 268
Income taxes, net of refunds 235 382
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid $ 103 $ 281