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Note 10 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Allocated Share-based Compensation Expense $ 138,461 $ 464,749
Cost of Sales [Member]    
Allocated Share-based Compensation Expense 6,209 5,877
Selling, General and Administrative Expenses [Member]    
Allocated Share-based Compensation Expense 109,322 435,497
Research and Development Expense [Member]    
Allocated Share-based Compensation Expense $ 22,930 $ 23,375