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Note 12 - Net Loss Per Share - Basic and Diluted Loss Per Share (Details) - USD ($)
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Numerator:    
Loss available to common stockholders $ (1,683,253) $ (812,680)
Denominator:    
Weighted average common shares outstanding (in shares) 32,236,039 31,800,103
Basic loss per common share (in dollars per share) $ (0.05) $ (0.03)
Diluted loss per common share (in dollars per share) $ (0.05) $ (0.03)
Employee Stock Option [Member]    
Potentially dilutive securities outstanding at period end excluded from the diluted computation as the inclusion would have been antidilutive:    
Options (in shares) 3,289,067 4,849,002