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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accretion of the lease liability $ 84 $ 85 $ 171 $ 179
Amortization of right-of-use assets $ 97 $ 74 $ 191 $ 168
Operating leases (in years) (Year) 4 years 8 months 12 days   4 years 8 months 12 days  
Finance leases (in years) (Year) 13 years 6 months   13 years 6 months  
Operating leases 14.10%   14.10%  
Finance leases 13.20%   13.20%