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Note 10 - Subsequent Events (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
May 02, 2019
USD ($)
$ / shares
Apr. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
shares
Stock Issued During Period, Shares, Warrants Exercised | shares         333,000
Stock Issued During Period, Value, Warrants Exercised | $     $ 25,000 $ 395,500 $ 420,500
Subsequent Event [Member]          
Stock Issued During Period, Shares, Warrants Exercised | shares   55,000      
Stock Issued During Period, Value, Warrants Exercised | $   $ 55,000      
Subsequent Event [Member] | Unrelated Party [Member]          
Proceeds from Short-term Debt, Total | $ $ 153,000        
Debt Instrument, Interest Rate, Stated Percentage 12.00%        
Subsequent Event [Member] | Unrelated Party [Member] | Scenario 1 [Member]          
Debt Instrument, Convertible, Variable Conversion Price, Percent By Market Price 65.00%        
Debt Instrument, Convertible, Conversion Price $ 1        
Subsequent Event [Member] | Unrelated Party [Member] | Scenario 2 [Member]          
Debt Instrument, Convertible, Conversion Price $ 1        
Subsequent Event [Member] | Unrelated Party [Member] | Minimum [Member]          
Prepayment Premium Percent 15.00%        
Subsequent Event [Member] | Unrelated Party [Member] | Minimum [Member] | Scenario 1 [Member]          
Debt Instrument, Convertible, Necessary Market Price 1.5        
Subsequent Event [Member] | Unrelated Party [Member] | Maximum [Member]          
Prepayment Premium Percent 35.00%        
Subsequent Event [Member] | Unrelated Party [Member] | Maximum [Member] | Scenario 2 [Member]          
Debt Instrument, Convertible, Necessary Market Price 1.5