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Note 7 - Commitments and Contingencies - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating lease cost $ 29 $ 29 $ 58 $ 58
Variable lease cost 7 7 14 14
Short-term lease cost 0 4 0 9
Total $ 36 $ 40 $ 72 $ 81