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Note 12 - Stockholders' Equity (Details Textual) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2020 shares | Oct. 05, 2017 | Oct. 02, 2017 shares | May 25, 2016 | Jun. 12, 2015 shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 $ / shares shares | Mar. 31, 2021 $ / shares | Jun. 13, 2016 shares
Increase (Decrease) in Common Stock Shares Authorized (in shares) |  |  | (300,000,000) |  | 100,000,000 |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  |  | 100,000,000 |  | 300,000,000 | 100,000,000 |  | 100,000,000 |  | 100,000,000 |  | 400,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares |  |  |  |  |  | $ 200,648 |  | $ 200,648 |  | $ 200,648 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  | 200,648 |  | 200,648 |  | 200,648 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 10.73 | $ 10.73 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  | 6 years 6 months 29 days |  | 7 years 25 days |  |
Plan 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 219,500 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 1,160,500 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  | 208,664 |  | 208,664 |  | 210,500 |  |
Plan 2013 [Member] | Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $ |  |  |  |  |  | $ 11,237 | $ 7,500 | $ 22,494 | $ 15,000 |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 10 |  | 10 |  |  |  |  |  |  |  |

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