Note 15 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Expense	$ 295,290	$ 171,975	$ 453,617	$ 305,820
Cost of Sales [Member]
Share-based Payment Arrangement, Expense	6,909	4,201	10,551	8,499
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense	283,314	163,932	427,241	284,973
Research and Development Expense [Member]
Share-based Payment Arrangement, Expense	$ 5,067	$ 3,842	$ 15,825	$ 12,348