Note 6 - Inventories - Schedule of Inventory (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Allowance for excess and obsolete inventory:	$ (1,275,000)	$ (815,000)
Total inventories, net	7,625,573	7,462,491
New Inventory [Member]
Inventory	1,496,145	1,371,545
Inventory	1,496,145	1,371,545
Refurbished and Used Inventory [Member]
Inventory	7,404,428	6,905,946
Inventory	$ 7,404,428	$ 6,905,946