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Note 2 - Significant Accounting Policies 1 (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Retained Earnings (Accumulated Deficit), Total $ (160,121,000) $ (152,175,000)
Cash and Cash Equivalents, at Carrying Value, Total $ 2,371,000 1,103,000
Cash, Percentage Held in One Financial Institution 99.00%  
Cash, Uninsured Amount $ 2,100,000  
Accounts Receivable, Allowance for Credit Loss, Current 0 34,000
Revenue, Remaining Performance Obligation, Amount $ 0 0
Standard Product Warranty, Term (Year) 2 years  
Standard Product Warranty Accrual, Ending Balance $ 0 $ 0