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Note 17 - Subsequent Events (Details Textual) | May 14, 2020 shares | May 12, 2020 shares | May 06, 2020 USD ($) $ / shares shares | Apr. 20, 2020 USD ($) | Apr. 02, 2020 shares | Mar. 12, 2020 $ / shares | Feb. 14, 2020 $ / shares | Nov. 11, 2015 $ / shares
--- | --- | --- | --- | --- | --- | --- | --- | ---
Share Price (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.76 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.65 | $ 3.60
Subsequent Event [Member] |  |  |  |  |  |  |  |
Proceeds from Paycheck Protection Program Under CARES Act | $ |  |  |  | $ 340,000 |  |  |  |
Subsequent Event [Member] | Warrants Issued in Connection with Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  | 1,900,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.16 |  |  |  |  |
Subsequent Event [Member] | Warrants Issued in Connection with Senior Secured Convertible Note [Member] | Maxim [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Percentage of Placement Fee from Gross Proceeds from Issuance of Warrants |  |  | 7.00% |  |  |  |  |
Subsequent Event [Member] | Warrants Issued to Investor for Business Referral [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  | 125,000 |  |  |  |  |  |
Subsequent Event [Member] | Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ |  |  | $ 2,415,000 |  |  |  |  |
Short-term Debt, Total | $ |  |  | $ 2,100,000 |  |  |  |  |
Debt Instrument, Number of Monthly Periodic Payments |  |  | 5 |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | $ |  |  | $ 268,333 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 1.16 |  |  |  |  |
Debt Instrument, Fee Amount | $ |  |  | $ 133,333 |  |  |  |  |
Stock Issued During Period, Shares, Due Diligence Fees (in shares) | shares |  |  | 114,943 |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  | $ 1.16 |  |  |  |  |
Directors [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) | shares | 1,632 | 7,077 |  |  | 6,850 |  |  |
A New Employee [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  | 5,000 |  |  |
Class of Warrant or Right, Vesting Period (Year) |  |  |  |  | 3 years |  |  |

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