Note 10 - Leases - Operating Lease Expense (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Total lease expense under ASC 842	$ 308,334	$ 241,994
Cost of Sales [Member]
Total lease expense under ASC 842	252,936	185,628
Selling, General and Administrative Expenses [Member]
Total lease expense under ASC 842	$ 55,398	$ 56,366