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Note 3 - Liquidity and Going Concern (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Nov. 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Income (Loss) Attributable to Parent, Total |  | $ (3,585,709) | $ (1,603,103) | $ 700,000
PNC [Member] | PNC Agreements, Amendment Two [Member] |  |  |  |
Debt Instrument, Covenant, Required Proceeds from Equity Issuance | $ 7,500,000 |  |  |

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