Note 13 - Major Customers and Export Revenue (Details Textual)	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Number of Countries in Which Products are Sold	4	6
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	1	2
Concentration Risk, Percentage		89.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	87.00%	68.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customer [Member]
Concentration Risk, Percentage		21.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	1	2
Concentration Risk, Percentage		98.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	95.00%	82.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customer [Member]
Concentration Risk, Percentage		16.00%