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Note 7 - Promissory Notes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Gain on Extinguishment of Promissory Notes With Related Party $ (65,955)        
Promissory Note [Member]          
Debt Instrument, Interest Rate, Stated Percentage     2.00%    
Gain on Extinguishment of Promissory Notes With Related Party   $ 94,191      
Interest on Convertible Debt, Equity Portion     $ 0 $ 18,796 $ 31,966
Promissory Note [Member] | Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member]          
Long-term Debt, Measurement Input     0.15    
Promissory Note, Debt Portion [Member] | Discounted Cash Flows Approach Valuation Technique [Member] | Measurement Input, Discount Rate [Member]          
Long-term Debt, Measurement Input     0.15