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Note 14 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Share-based compensation expense $ 171,975 $ 145,769 $ 305,820 $ 284,250
Cost of Sales [Member]        
Share-based compensation expense 4,201 5,047 8,499 11,256
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 154,250 120,113 266,101 229,455
Research and Development Expense [Member]        
Share-based compensation expense $ 13,524 $ 20,609 $ 31,220 $ 43,539