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Note 5 - Operating Lease Right-of-use (ROU) Asset, Net (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating Lease, Expense $ 121,000 $ 121,000 $ 362,000 $ 362,000
Operating Lease, Payments $ 125,000 $ 122,000 $ 374,000 $ 364,000
Operating Lease, Weighted Average Remaining Lease Term 1 year 4 months 2 days   1 year 4 months 2 days  
Operating Lease, Weighted Average Discount Rate, Percent 10.74%   10.74%