Note 4 - Inventory - Inventory (Details) - USD ($)	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Raw materials and component parts	$ 2,637,138	$ 2,659,171	$ 2,022,092
Work-in-process	523,644	370,506	438,447
Finished products	1,200,204	1,301,338	1,083,852
Total Inventory	4,360,986	4,331,015	3,544,391
Less: Inventory reserves	457,505	473,252	235,592
Net Inventory	$ 3,903,481	$ 3,857,763	$ 3,308,799