v3.21.2

Note 5 - Stockholders' Equity (Deficit) (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2020
Common Stock, Shares Authorized (in shares) | 50,000,000 |  | 50,000,000 |  |  |  | 50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.00001 |  | $ 0.00001 |  |  |  | $ 0.00001
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  | 12,278 |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 249,980 | $ 145,200 | $ 249,980 | $ 145,200 |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 280,681 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) | 12,278 | 60,000 | 12,278 | 60,000 |  |  |
Stock Issued During Period, Value, Issued for Services | $ 0 | $ 1 | $ 0 | $ 1 |  |  |
Stock Issued During Period, Shares, Cashless Warrant Exercised (in shares) | 39,395 |  | 100,879 |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 | 0 |  |  |
Share-based Payment Arrangement, Expense | $ 4,123 | 26,161 | $ 10,770 | $ 278,233 |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | 632 |  | $ 632 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 month 6 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | 1,939,766 | $ 121,797 | $ 5,700,793 | $ 284,897 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 7 months 6 days |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 6,213,390 |  | $ 6,213,390 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employee [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 390,366 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 265,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board Members [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 206,068 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board Members [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 50.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board Members [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 50.00% |  |  |  |
The 2016 Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Plan, Expiration Period (Year) |  |  |  |  |  | 10 years |
The 2018 Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Plan, Expiration Period (Year) |  |  |  |  | 10 years |  |

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