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Note 10 - Summary of Share-based Compensation Expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Cost of Sales [Member]        
Share-based compensation expense $ 6,101 $ 6,851 $ 11,738 $ 11,671
Selling, General and Administrative Expenses [Member]        
Share-based compensation expense 128,405 125,224 246,360 230,446
Research and Development Expense [Member]        
Share-based compensation expense 25,811 45,332 50,159 66,737
Share-based compensation expense $ 160,317 $ 177,407 $ 308,257 $ 308,854