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Note 9 - Subsequent Events (Details Textual) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 08, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | May 21, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | (0) |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 5.00
Proceeds from Stock Options Exercised |  | $ 0 | $ 133,200 |
Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | 3,100 |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 2.96 |  |  |
Proceeds from Stock Options Exercised | $ 9,176 |  |  |

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