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Note 5 - Operating Lease Right-of-use Asset, Net (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating Lease, Expense $ 120,000 $ 120,000 $ 241,000 $ 241,000
Operating Lease, Payments $ 121,000 $ 118,000 $ 242,000 $ 236,000
Operating Lease, Weighted Average Remaining Lease Term 2 years 7 months 2 days   2 years 7 months 2 days  
Operating Lease, Weighted Average Discount Rate, Percent 10.74%   10.74%