Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Interim Consolidated Financial Statement Details (Details Textual)

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Note 4 - Interim Consolidated Financial Statement Details (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Dec. 31, 2017
Depreciation, Total     $ 1,543 $ 1,950  
Property, Plant and Equipment, Net, Ending Balance $ 11,732   11,732   $ 10,269
Impairment of Long-Lived Assets Held-for-use $ 1,601 1,601  
Machinery and Equipment [Member]          
Capital Leased Assets, Gross, Total 1,069   1,069   533
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 258   258   222
Machinery and Equipment [Member] | CHINA          
Property, Plant and Equipment, Net, Ending Balance 1,161   1,161    
Long-lived Assets, Amount in Excess of Carrying Value 1,112   1,112    
Impairment of Long-Lived Assets Held-for-use     0    
Long-lived Assets, Fair Value Assumption, Revenue Projection Decreased by Ten Percent, Recoverable Amount 775   775    
Machinery and Equipment [Member] | Assets Under Capital Lease [Member]          
Depreciation, Total 21 55 36 133  
Computer Equipment [Member]          
Capital Leased Assets, Gross, Total 91   91   0
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 5   5   $ 0
Computer Equipment [Member] | Assets Under Capital Lease [Member]          
Depreciation, Total $ 5 $ 0 $ 5 $ 3