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Note 3 - Liquidity and Going Concern (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 01, 2020 | Jan. 03, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 26, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Sale of Stock, Number of Shares Issued in Transaction |  |  | $ 3,626,600 |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  | (638,696) | $ (2,494,088) |  | $ (7,100,000) | $ (3,600,000) | $ (1,600,000)
Claims For Non Payment Of Contractual Obligations [Member] |  |  |  |  |  |  |  |
Aggregate Claims Made or Threatened |  |  | $ 500,000 |  |  |  |  |
Purchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 400,000 |  |  |
Purchase Agreement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  | 500,000 |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 10 |  |  |  |  |  |
Sale of Stock, Offering Amount |  | $ 5,000,000 |  |  |  |  |  |
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 478,017 |  |  |  |  |  |  |
Accounts Receivable, Shares Converted to Preferred Stock (in shares) | 48,200 |  |  |  |  |  |  |
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Other Investors [Member] |  |  |  |  |  |  |  |
Sale of Stock, Additional Authorized Shares |  | $ 2,000,000 |  |  |  |  |  |
Purchase Agreement [Member] | Series A Preferred Stock [Member] | Other Investors [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | $ 1,000,000 |  |  |  |  |  |  |

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