Note 5 - Inventories - Schedule of Inventory (Details) - USD ($)	Mar. 31, 2020	Sep. 30, 2019
Allowance for excess and obsolete inventory	$ (3,400,000)	$ (1,275,000)
Total inventories, net	5,406,181	7,625,573
New Inventory [Member]
Inventory	946,878	1,496,145
Inventory	946,878	1,496,145
Refurbished and Used Inventory [Member]
Inventory	7,859,303	7,404,428
Inventory	$ 7,859,303	$ 7,404,428