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Note 7 - Stock Option Plans (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2022 | Jun. 28, 2023
Share-Based Payment Arrangement, Expense | $ 330,788 | $ 313,505 |  |  |
Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | 171,000 | 175,000 |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Payment Arrangement, Amount Capitalized | $ 700,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 6,600 | 1,100 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 16,666 |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 0 | 2,100 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 0 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 0 |  |  |  |
Restricted Stock [Member] | Territory Manager [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 2 years |
Restricted Stock [Member] | Board of Directors [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 154,000 | $ 137,500 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 0 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 730,340 |  |  |  |
Share Price (in dollars per share) | $ 0.89 |  |  |  |
Restricted Stock [Member] | Board of Directors [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |
Restricted Stock [Member] | Board of Directors [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |
The 2020 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  | 11,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 5 years |  |

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