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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