Note 7 - Major Customers and Export Sales - Foreign and Domestic Net Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Revenues, Total	$ 907,177	$ 1,019,105	$ 2,547,672	$ 3,035,812
Domestic [Member]
Revenues, Total	832,441	1,008,380	2,343,878	2,792,102
Foreign [Member]
Revenues, Total	$ 74,736	$ 10,725	$ 203,794	$ 243,710