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Note 9 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 26, 2023 | Jan. 03, 2023 | Jun. 23, 2022 | May 17, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2013 | Dec. 31, 2022 | Apr. 08, 2021
Common Stock, Shares Authorized (in shares) | 12,500,000 |  |  |  |  | 12,500,000 |  | 12,500,000 |  |  | 12,500,000 |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 | $ 0.001
Common Stock, Shares, Issued (in shares) | 5,700,226 |  |  |  |  | 5,700,226 |  | 5,700,226 |  |  | 5,498,260 |
Preferred Stock, Shares Authorized (in shares) | 2,500,000 |  |  |  |  | 2,500,000 |  | 2,500,000 |  |  | 2,500,000 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Preferred Stock, Shares Issued (in shares) | 0 |  |  |  |  | 0 |  | 0 |  |  | 0 |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  |  | $ 0.50 |  | $ 0.50 |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  | 0 | 4,363,229 |  |  |
Common Stock, Shares, Outstanding (in shares) | 5,700,226 |  |  |  |  | 5,700,226 |  | 5,700,226 |  |  | 5,498,260 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 225,604 |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 193,924 | $ 221,472 | $ 351,097 | $ 400,249 |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 965,796 |  |  |  |  | $ 965,796 |  | $ 965,796 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 140,441 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | The 2022 Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 201,104 |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  | $ 4.00 |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |
Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.008 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 3,803,133 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 3.992 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  |  | $ 15,182,075 |  |  |  |  |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 531,250 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 5.20 |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  | 28,846 |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) |  | 24,500 | 2,340 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  | $ 73,500 | $ 110,254 |  |  |  |  |  |  |  |  |
Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant |  |  |  |  |  |  |  |  |  | $ 36,750 |  |
Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) |  |  | 158,330 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  |  | $ 674,164 |  |  |  |  |  |  |  |  |
Board of Directors Chairman [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant |  |  |  |  |  |  |  |  |  | $ 73,500 |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued (in shares) | 0 |  |  |  |  | 0 |  | 0 |  |  |  |

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