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Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) | Jun. 05, 2020 | Apr. 30, 2020 | Apr. 13, 2020
--- | --- | --- | ---
Proceeds from Paycheck Protection Program Under CARES Act |  | $ 1,047,700 |
Warrants Issued with Second Purchase Agreement Amendment [Member] |  |  |
Warrants Issued, Percentage of Common Stock Issuable | 10.00% |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1 |  |
Second Purchase Agreement Amendment [Member] |  |  |
Sale of Stock, Offering Fee, Percentage | 10.00% |  |
Second Purchase Agreement Amendment [Member] | Common Stock [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 260,000
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 50,000 |  | 130,000
Shares Issued, Price Per Share (in dollars per share) | $ 10 |  | $ 10
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 500,000 |  | $ 1,300,000

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