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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current | $ 35,000 | $ 45,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 46,400 | 19,600 |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (1,437,000) | $ (1,489,000) |
Advertising Expense | 60,000 | 102,000 |
Share-Based Payment Arrangement, Option [Member] |  |  |
Share-Based Payment Arrangement, Expense | 25,000 | 43,000 |
Restricted Stock [Member] |  |  |
Share-Based Payment Arrangement, Expense | $ 145,000 | $ 104,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period | 227,000 | 21,772 |
The2004 Plan Member |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 46,400 | 19,600 | 5,009,750
Incentive Plan 2020 [Member] | Restricted Stock [Member] |  |  |
Share-Based Payment Arrangement, Expense | $ 145,000 | $ 104,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period | 227,000 | 21,772 |
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 5 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 17 years |  |

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