Note 10 - Major Customers and Export Sales (Details Textual)	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Number of Countries in Which Products are Sold	2	1
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	2	2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage	100.00%	87.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	89.00%	61.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage	11.00%	26.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	1	1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage	100.00%	99.00%