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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, 2020
Mar. 31, 2019
Cash paid for:    
Interest $ 12 $ 47
Income taxes, net of refunds (156)
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid 232 108
Recognition of lease asset and liability $ 3,831