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Note 5 - Commitments and Contingencies - Lease Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating lease expense $ 181 $ 159 $ 362 $ 347
Short term lease expense 21 75 42 102
Variable lease expense 22 23 44 46
Total operating lease cost 224 257 448 495
Amortization of right-of-use assets 30 28 61 89
Interest on lease liabilities 82 99 173 119
Total finance lease cost 112 127 234 208
Operating cash flows used in operating leases 166 174 330 338
Operating cash flows used in finance leases 82 99 173 118
Financing cash flows used in finance leases $ 228 $ 50 $ 311 $ 182