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Note 2 - Significant Accounting Policies 1 (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Retained Earnings (Accumulated Deficit), Total | $ (152,175,000) | $ (140,604,000)
Cash and Cash Equivalents, at Carrying Value, Total | 1,103,000 | 7,363,000
Cash, Uninsured Amount | 800,000 |
Accounts Receivable, Allowance for Credit Loss, Current | 34,000 | 11,000
Revenue, Remaining Performance Obligation, Amount | $ 0 | 341,000
Standard Product Warranty, Term (Year) | 2 years |
Standard Product Warranty Accrual, Ending Balance | $ 0 | $ 0

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