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Note 4 - Other Accrued Liabilities - Other Accrued Liabilities (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Insurance $ 0 $ 591,000
Professional services 291,000 92,000
Operating costs 782,000 539,000
Other 848,000 322,000
Total other accrued liabilities $ 1,921,000 $ 1,544,000