Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Income Taxes (Details Textual)

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Note 7 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Dec. 30, 2012
Jan. 01, 2012
Dec. 26, 2010
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]              
Open Tax Year     2010        
Earliest Tax Year [Member] | Mexican Tax Authority [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2010        
Earliest Tax Year [Member] | State Administration of Taxation, China [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2010        
Earliest Tax Year [Member] | Canada [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2010        
Earliest Tax Year [Member] | Inland Revenue, Hong Kong [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2008        
Latest Tax Year [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]              
Open Tax Year     2014        
Latest Tax Year [Member] | Mexican Tax Authority [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2014        
Latest Tax Year [Member] | State Administration of Taxation, China [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2014        
Latest Tax Year [Member] | Canada [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2014        
Latest Tax Year [Member] | Inland Revenue, Hong Kong [Member] | Foreign Tax Authority [Member]              
Open Tax Year     2014        
Deferred Tax Assets, Valuation Allowance         $ 0 $ 0 $ 0
Income Tax Expense (Benefit) $ 125,000 $ 163,000 $ 395,000 $ 606,000