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Note 9 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2022 | Aug. 17, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2013 | Dec. 31, 2021 | Apr. 08, 2021 | May 21, 2020
Common Stock, Shares Authorized (in shares) |  |  | 100,000,000 |  |  | 100,000,000 |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 |
Common Stock, Shares, Issued (in shares) |  |  | 21,352,688 | 21,697,373 |  | 21,285,706 |  |
Preferred Stock, Shares Authorized (in shares) |  |  | 2,500,000 |  |  | 2,500,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001 |  |  | $ 0.001 |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  | 0 |  |  | 0 |  |
Stock Issued During Period, Value, Issued for Services |  |  |  | $ 0 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  | 515,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 5.00
Class of Warrant or Right, Issued by Exchange, Shares (in shares) |  | 500,000 | 0 | 0 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  | 21,352,688 | 21,697,373 |  | 21,285,706 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 561,862 |  |  | 149,636 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 479,208 |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 178,778 | $ 102,388 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 1,949,981 |  |  |  |  |
Prefunded Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.001 |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) | 18,641 |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 140,000 |  |  |  |  |  |  |
Director [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 25,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant |  |  |  |  | $ 36,750 |  |  |
Management [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) | 48,341 |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 299,196 |  |  |  |  |  |  |
Management [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 454,249 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |  |  |
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, Total (in shares) |  |  | 0 |  |  |  |  |

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