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Note 3 - Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash paid for:    
Interest $ 39 $ 55
Income taxes, net of refunds 4,274 1,454
Non-cash investing and financing activities:    
Capital additions accrued but not yet paid $ 225 $ 225