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Note 24 - Subsequent Events (Details Textual) - USD ($) | Apr. 01, 2020 | Jan. 13, 2020 | Apr. 13, 2020 | Feb. 28, 2020 | Feb. 24, 2020 | Jan. 03, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | ---
Preferred Stock, No Par Value (in dollars per share) |  |  |  |  |  |  | $ 0 | $ 0
Forecast [Member] | Conversion to an Accounts Receivable [Member] |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 482,000 |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Forecast [Member] | Conversion to an Accounts Receivable [Member] |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 48,200 |  |  |  |  |  |  |
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock Warrants [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Exercise Price (in dollars per share) |  |  | $ 1 |  |  |  |  |
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  | 130,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 10 |  |  |  |  |
Sale of Stock, Offering Amount |  |  | $ 1,300,000 |  |  |  |  |
Sale of Stock, Offering Fee, Percent |  |  | 10.00% |  |  |  |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  | 260,000 |  |  |  |  |
Subsequent Event [Member] | Purchase Agreement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  |  |  |  | 500,000 |  |
Preferred Stock, No Par Value (in dollars per share) |  |  |  |  |  | $ 0 |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  |  |  | 10 |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 10 |  |
Sale of Stock, Offering Amount |  |  |  |  |  | $ 5,000,000 |  |
Subsequent Event [Member] | First Closing of the Offering [Member] | Series A Preferred Stock Warrants [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Exercise Price (in dollars per share) |  | $ 1 |  |  |  |  |  |
Subsequent Event [Member] | First Closing of the Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 2,500,000 |  |  |  |  |  |
Sale of Stock, Offering Fee, Percent |  | 10.00% |  |  |  |  |  |
Subsequent Event [Member] | Purchase Agreement Amendment [Member] | Series A Preferred Stock Warrants [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Exercise Price (in dollars per share) |  |  |  | $ 1 |  |  |  |
Subsequent Event [Member] | Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  |  |  | 70,000 |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  | $ 10 |  |  |
Sale of Stock, Offering Amount |  |  |  |  | $ 700,000 |  |  |
Sale of Stock, Offering Fee, Percent |  |  |  | 10.00% |  |  |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  |  |  | 140,000 |  |  |
Subsequent Event [Member] | Additional Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 10 |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  |  |  |  | 200,000 |  |

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