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Note 10 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 23, 2022 | May 19, 2022 | May 17, 2022 | Jan. 03, 2022 | Aug. 17, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2013 | Dec. 31, 2021 | Apr. 08, 2021 | Dec. 31, 2020 | May 21, 2020
Common Stock, Shares Authorized (in shares) |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  | 100,000,000 |  |  |
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) |  |  |  |  |  | 43,888,538 | 21,777,373 | 43,888,538 | 21,777,373 |  | 21,285,706 |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 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 |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  |  | 0 |  | 0 |  |  | 0 |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 26,450,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 35,920,000 | 515,000 | 35,920,000 | 515,000 |  | 1,015,000 |  | 515,000 |
Stock Issued During Period, Value, New Issues |  |  |  |  |  | $ 24,453,528 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 1,996,472 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 0.50 |  | $ 0.50 |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  | 34,905,000 | 0 |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  | 43,888,538 | 21,777,373 | 43,888,538 | 21,777,373 |  | 21,285,706 |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  | 0 |  | 0 |  |  | 0 |  |  |
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) |  |  |  |  |  | 2,587,009 |  | 2,587,009 |  |  | 149,636 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 2,649,207 |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 221,472 | $ 125,076 | $ 400,249 | $ 227,464 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  | $ 1,243,836 |  | $ 1,243,836 |  |  |  |  |  |
Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  | 30,425,000 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |
Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 15,182,075 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 30,425,000 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 0.499 |  |  |  |  |  |  |  |  |  |  |
Private Placement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 4,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 15,635,850 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 0.50 |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 3,450,000 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 230,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  |  | 18,641 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  | 2,536,175 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Management [Member] | Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 80,000 |  |  |  |  |  |
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 |  | 0 |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |

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