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Note 8 - Stockholders' Equity - Stock Option Activity (Details) - $ / shares
9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Shares Outstanding (in shares) 1,050,000 800,000
Outstanding, weighted average exercise price (in dollars per share) $ 1.64 $ 1.69
Outstanding, weighted average contractual term (Year) 4 years 4 years
Shares Vested and expected to vest (in shares) 1,050,000  
Vested and expected to vest, weighted average exercise price (in dollars per share) $ 1.64  
Vested and expected to vest, weighted average contractual term (Year) 3 years 255 days  
Shares Exercisable (in shares) 850,000  
Exercisable, weighted average exercise price (in dollars per share) $ 1.68  
Exercisable, weighted average contractual term (Year) 3 years 219 days