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Note 5 - Operating Lease Right-of-use Asset, Net (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating Lease, Payments $ 121,000 $ 121,000 $ 362,000 $ 362,000
Operating Lease, Payments $ 122,000 $ 117,000 $ 364,000 $ 353,000
Operating Lease, Weighted Average Remaining Lease Term 2 years 4 months 2 days   2 years 4 months 2 days  
Operating Lease, Weighted Average Discount Rate, Percent 10.74%   10.74%