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Note 5 - Other Long-Term Obligations and Commitments (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Lease, Weighted Average Discount Rate, Percent 9.50%  
Operating Lease, Cost $ 185,000 $ 179,000
Operating Lease, Payments $ 202,000 $ 191,000
Operating Lease, Weighted Average Remaining Lease Term 9 months 26 days 7 months 24 days
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year $ 618,000  
Lessee, Operating Lease, Liability, to be Paid, Year One 291,000  
Lessee, Operating Lease, Liability, to be Paid, Year Two 127,000  
Lessee, Operating Lease, Liability, to be Paid, Year Three 27,000  
Operating Lease, Expense $ 221,000 $ 204,000