Note 9 - Major Customers and Export Sales (Details Textual)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Number of Countries in Which Products are Sold	2	2	2	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	2	2	2	2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage	87.00%	94.00%	75.00%	92.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer One [Member]
Concentration Risk, Percentage	63.00%	49.00%	63.00%	61.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Two [Member]
Concentration Risk, Percentage	24.00%	45.00%	12.00%	31.00%