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Note 3 - Business Combination - Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Restructuring charges	$ 149		$ 149
Cash payments	(4)
Liability as of March 28, 2020	145		145
Employee Severance [Member]
Restructuring charges	129
Cash payments	(4)
Liability as of March 28, 2020	125		125
Facility Closing [Member]
Restructuring charges	20
Cash payments
Liability as of March 28, 2020	$ 20		$ 20