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