Note 5 - Inventories - Schedule of Inventory (Details) - USD ($)	Jun. 30, 2020	Sep. 30, 2019
Allowance for excess and obsolete inventory	$ (3,400,000)	$ (1,275,000)
Total inventories, net	5,964,490	7,625,573
New Inventory [Member]
Inventory	1,174,899	1,496,145
Refurbished and Used Inventory [Member]
Inventory	$ 8,189,591	$ 7,404,428