Annual report pursuant to Section 13 and 15(d)

Note 4 - Consolidated Financial Statement Details (Details Textual)

v3.8.0.1
Note 4 - Consolidated Financial Statement Details (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 07, 2017
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Inventory Valuation Reserves   $ 619 $ 442  
Depreciation   3,588 4,110 $ 3,967
Impairment of Long-Lived Assets Held-for-use   1,601
Property, Plant and Equipment, Net   10,269 14,437  
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment $ 870      
UNITED STATES        
Impairment of Long-Lived Assets Held-for-use   1,025    
Long-lived Assets, Fair Value Assumption, Revenue Projection Decreased by One Percent, Recoverable Amount   110    
Machinery and Equipment [Member]        
Capital Leased Assets, Gross   533 2,193  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation   222 673  
Impairment of Long-Lived Assets Held-for-use 576      
Property, Plant and Equipment, Transfers and Changes   1,660    
Machinery and Equipment [Member] | Corporate Segment [Member]        
Impairment of Long-Lived Assets Held-for-use 130      
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 5      
Property, Plant and Equipment, Disposals 135      
Machinery and Equipment [Member] | UNITED STATES        
Property, Plant and Equipment, Net   1,188    
Long-lived Assets, Fair Value Assumption, Effect of One Percent Increase in WACC on Impairment   37    
Machinery and Equipment [Member] | CHINA        
Impairment of Long-Lived Assets Held-for-use   0    
Long-lived Assets, Fair Value Assumption, Revenue Projection Decreased by One Percent, Recoverable Amount   1,060    
Long-lived Assets Evaluated for Impairment   1,380    
Long-lived Assets, Amount in Excess of Carrying Value   1,410    
Machinery and Equipment [Member] | CHINA | Impaired Assets Group 1 [Member]        
Impairment of Long-Lived Assets Held-for-use 265      
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 118      
Property, Plant and Equipment, Disposals 383      
Machinery and Equipment [Member] | CHINA | Impaired Assets Group 2 [Member]        
Impairment of Long-Lived Assets Held-for-use 181      
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment 291      
Property, Plant and Equipment, Disposals $ 472      
Machinery and Equipment [Member] | Assets Under Capital Lease [Member]        
Depreciation   162 $ 673  
Impairment of Long-Lived Assets Held-for-use   $ 97