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 ($)
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Dec. 31, 2017
Depreciation, Total $ 774,000 $ 979,000  
Property, Plant and Equipment, Net, Ending Balance 9,592,000   $ 10,269,000
Machinery and Equipment [Member]      
Capital Leased Assets, Gross, Total 533,000   533,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation 237,000   $ 222,000
Machinery and Equipment [Member] | CHINA      
Property, Plant and Equipment, Net, Ending Balance 1,262,000    
Long-lived Assets, Amount in Excess of Carrying Value 1,056,000    
Impairment of Long-Lived Assets Held-for-use 0    
Long-lived Assets, Fair Value Assumption, Revenue Projection Decreased by Ten Percent, Recoverable Amount 731    
Machinery and Equipment [Member] | Assets Under Capital Lease [Member]      
Depreciation, Total $ 15,000 $ 78,000