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Note 10 - Contingent Liabilities and Commitments (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Nov. 07, 2025 | Oct. 01, 2025 | Sep. 30, 2025 | Sep. 29, 2025 | Mar. 28, 2022 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jan. 01, 2025 | Dec. 31, 2024 | Jan. 01, 2024 | Jan. 01, 2023 | Jan. 01, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  | 207,983 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 6 years 1 month 6 days | 4 years 1 month 6 days | 5 years 8 months 12 days | 4 years 3 months 18 days |  |  |  |  |
First Defense, Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  | $ 65,000 |  |  | $ 65,000 |  | $ 65,000 |  |  |  |  |  |
Purchase of Inventory [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  | 1,318,000 |  |  | 1,318,000 |  | 1,318,000 |  |  |  |  |  |
Information Technology Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  | 258,000 |  |  | 258,000 |  | 258,000 |  |  |  |  |  |
Other Obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  | $ 614,000 |  |  | $ 614,000 |  | $ 614,000 |  |  |  |  |  |
President and CEO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salary and Wage, Officer, Excluding Cost of Good and Service Sold |  |  |  | $ 450,000 |  |  |  |  |  |  |  |  |  |
Employment Agreement, Maximum Amount of Potential Additional Annual Cash Bonuses |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Maximum Shares Issuable (in shares) |  |  | 150,260 |  |  | 150,260 |  | 150,260 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 75,983 |  |  |  |  |  |  |  |  |  |  |
President and CEO [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
President and CEO [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employment Agreement, One-Time Signing Bonus |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 74,277 |  |  |  |  |  |  |  |  |  |  |  |  |
President and CEO [Member] | Deferred Compensation, Excluding Share-Based Payments and Retirement Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Recorde Liability, Earned and Unpaid Sick Time |  |  | $ 239,369 |  |  | $ 239,369 |  | $ 239,369 |  |  | $ 230,162 |  |  | $ 222,379
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Deferred Compensation Arrangement with Individual, Recorded Liability |  |  |  |  |  |  |  |  |  | $ 300,000 |  | $ 200,000 | $ 100,000 |
Deferred Compensation Arrangement with Individual, Recorded Liability, Vested Compensation |  |  | 0 |  |  | 0 |  | 0 |  |  | 300,000 |  |  |
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Month) |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |
Indemnification Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  | 0 |  |  | 0 |  | 0 |  |  | 0 |  |  |
Fair Value Guarantee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  | 0 |  |  | 0 |  | 0 |  |  | $ 0 |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  | $ 0 |  |  | $ 0 |  | $ 0 |  |  |  |  |  |

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