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Note 8 - Stockholders' Equity - Warrant Activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Outstanding, warrants (in shares) 11,238,650 11,238,650
Outstanding, warrants, weighted average exercise price (in dollars per share) $ 1.52 $ 1.52
Outstanding, warrants, weighted average remaining contract term (Year) 1 year 182 days 2 years 109 days
Exercisable, warrants (in shares) 11,238,650  
Exercisable, warrants, weighted average exercise price (in dollars per share) $ 1.52  
Exercisable, warrants, weighted average remaining contract term (Year) 1 year 182 days