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Note 13 - Commitment (Details Textual) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 25, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 30, 2020 | Sep. 23, 2015
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 8,681
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 12.00 | $ 28.80
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] |  |  |  |  |
Related Party Agreement, Term (Year) | 1 year |  |  |  |
Related Party Transaction, Revenue Needed to Trigger Payment of Sales Incentive Fee | $ 5,000,000 |  |  |  |
Related Party Transaction, Revenue to Trigger Payment of Sales Incentive Fee, Percent of Net Income, Minimum | 20.00% |  |  |  |
Related Party Transaction, Sales Incentive Fee For Each 5 Million Revenue | $ 500,000 |  |  |  |
Stock Issuable for Sales Incentive Fee Per Each 5 Million Revenue (in shares) | 62,500 |  |  |  |
Related Party Transaction, Maximum Revenue, Warrants Issuable | $ 25,000,000 |  |  |  |
Revenue from Related Parties |  | $ 0 | $ 0 |  |
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] | Warrants Issuable for Each 1 Million Revenue in Excess of 20 Million [Member] |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 12,500 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 12.00 |  |  |  |
Technology Transfer Institute [Member] | Sales Incentive Agreement With TTI [Member] | Maximum [Member] |  |  |  |  |
Related Party Transaction, Maximum Revenue to Trigger Payment of Sales Incentive Fee | $ 20,000,000 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 62,500 |  |  |  |
Stock Issuable for Sales Incentive Agreement (in shares) | 250,000 |  |  |  |

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