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Note 6 - Stock-based Compensation (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 01, 2016 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 1,262,500 | 1,515,000 | 1,220,000 | 1,220,000 | 1,262,500 | 1,220,000 | 1,395,000 | 1,349,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 127,500 | 145,000 | 10,000 | 0 | 272,500 | 10,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 360,000 | 25,000 | 0 |  | 385,000 | 0 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 210,230 |  |  |  | $ 210,230 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) |  |  |  |  |  | 5 months |  |  |
Share-based Payment Arrangement, Expense |  | $ 111,862 |  | $ 356 |  | $ 139,573 | $ 806 |  |
The 2016 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 1,000,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 828,500 |  |  |  | 828,500 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) |  | 346,000 |  |  |  | 346,000 |  |  |
The 2006 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 1,950,000 |  |  |  | 1,950,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 10 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 434,000 |  |  |  | 434,000 |  |  |
Minimum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  |  |  |  |  | 6 months |  |  |
Maximum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  |  |  |  |  | 2 years |  |  |

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