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Note 3 - Restructuring Charges - Summaries of the Restructuring Activities and Associated Costs Incurred (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Non-cash charges         $ (20)  
Cash receipts (payments)           $ 3
Liability, end of period $ 18 $ 97 $ 165 $ 611 624 663
Liability, beginning of period 97 165 270 624 663 735
Restructuring charges 60 25 48 58 100 (75)
Cash payments (139) (93) (153) (71) (119)  
Equipment Relocation Costs [Member]            
Non-cash charges          
Cash receipts (payments)           (75)
Liability, end of period 58
Liability, beginning of period 31
Restructuring charges 60 25 48 58 21 75
Cash payments (60) (25) (79) (21)  
Employee Severance [Member]            
Non-cash charges          
Cash receipts (payments)           (72)
Liability, end of period 18 97 165 553 604 663
Liability, beginning of period 97 165 239 604 663 735
Restructuring charges
Cash payments (79) (68) (74) (51) (59)  
Facility Closing [Member]            
Non-cash charges          
Cash receipts (payments)           (30)
Liability, end of period 20
Liability, beginning of period 20
Restructuring charges 59 30
Cash payments (20) (39)  
Gain on Sale of Property and Equipment [Member]            
Non-cash charges          
Cash receipts (payments)           180
Liability, end of period
Liability, beginning of period
Restructuring charges (180)
Cash payments  
Asset Impairment Charges [Member]            
Non-cash charges         (20)  
Cash receipts (payments)          
Liability, end of period
Liability, beginning of period
Restructuring charges 20
Cash payments