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Note 12 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cost of Sales [Member]    
Share-based compensation expense $ 24,092 $ 25,355
Selling, General and Administrative Expenses [Member]    
Share-based compensation expense 478,695 473,118
Research and Development Expense [Member]    
Share-based compensation expense 102,639 120,728
Share-based compensation expense $ 605,426 $ 619,201