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Note 6 - Stockholders' Equity (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  | 2,809,060 | 2,027,153 |  | 2,809,060 | 2,027,153 | 2,440,673 | 2,066,343
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 3,800 | $ 5,000 |  | $ 17,000 | $ 15,000 |  |
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | 321,000 | $ 233,000 |  | $ 1,100,000 | $ 1,100,000 |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  | $ 0.89 |  |  |
Restricted Stock [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 137,500 |  |  | $ 445,000 |  |  |
The 2020 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  | 11,500,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |  |  |
The 2020 Equity Incentive Plan [Member] | Vice Chairman of the Board of Directors [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  | 5 years |  |  |
Chief Executive Officer, and Other Employees [Member] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  | 2,426,364 | 1,852,789 |  | 2,426,364 | 1,852,789 |  |
Non-Employees [Member] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 382,696 | 174,364 |  | 382,696 | 174,364 |  |
Territory Manager [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  | 18,947 |  |  | 18,947 |  |  |
Share-Based Payment Arrangement, Expense |  | $ 36,500 | $ 10,400 |  | $ 17,700 | $ 37,500 |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period (Year) |  |  |  |  | 2 years |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | 5,200 |  |  | $ 5,200 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 5 months 15 days |  |  |
Board of Directors [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) | 617,978 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 0.89 |  |  |  |  |  |  |
Director [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 269,000 |  |  | $ 269,000 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  | 6 months |  |  |
Director [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |
Director [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |

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