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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, 2021
Jun. 30, 2020
Cash paid for:    
Interest $ 26 $ 40
Income taxes, net of refunds 3,112 235
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid $ 202 $ 103