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Note 5 - Commitments and Contingencies - Non-cash Flow Information Related to ROU Asset and Lease Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accretion of the lease liability $ 81 $ 83 $ 252 $ 262
Amortization of right-of-use assets $ 100 $ 76 $ 291 $ 244
Operating leases (in years) (Year) 4 years 6 months   4 years 6 months  
Finance leases (in years) (Year) 13 years 3 months 18 days   13 years 3 months 18 days  
Operating leases 14.10%   14.10%  
Finance leases 13.20%   13.20%