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Note 4 - Restructuring Charges - Summary of Restructuring Activities and Associated Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Liability, beginning of period $ 270 $ 735
Restructuring charges, net 164 115
Cash payments   (434) (740)
Non-cash charges   160
Liability, end of period   270
Asset Impairment Charges [Member]      
Liability, beginning of period
Restructuring charges, net   20
Cash payments  
Non-cash charges   (20)
Liability, end of period  
Equipment Relocation Costs [Member]      
Liability, beginning of period 31
Restructuring charges, net   164 186
Cash payments   (195) (155)
Non-cash charges  
Liability, end of period   31
Employee Severance [Member]      
Liability, beginning of period 239 735
Restructuring charges, net  
Cash payments   (239) (496)
Non-cash charges  
Liability, end of period   239
Facility Closing [Member]      
Liability, beginning of period
Restructuring charges, net   89
Cash payments   (89)
Non-cash charges  
Liability, end of period  
Gain on Sale of Property and Equipment [Member]      
Liability, beginning of period
Restructuring charges, net   (180)
Cash payments  
Non-cash charges   180
Liability, end of period