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 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Dec. 31, 2017
Depreciation, Total     $ 2,426 $ 2,789  
Property, Plant and Equipment, Net, Ending Balance $ 12,351   12,351   $ 10,269
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 292   292   222
Machinery and Equipment [Member] | CHINA          
Property, Plant and Equipment, Net, Ending Balance 1,165   1,165    
Machinery and Equipment [Member] | Assets Under Capital Lease [Member]          
Depreciation, Total 34 $ 15 70 148  
Computer Equipment [Member]          
Capital Leased Assets, Gross, Total 91   91   0
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 13   13   $ 0
Computer Equipment [Member] | Assets Under Capital Lease [Member]          
Depreciation, Total $ 8 $ 0 $ 13 $ 0