Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Income Taxes (Details)

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Note 7 - Income Taxes (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 30, 2012
Jan. 01, 2012
Dec. 26, 2010
Note 7 - Income Taxes (Details) [Line Items]              
Income Tax Expense (Benefit) $ 193,000 $ 260,000 $ 270,000 $ 443,000      
Deferred Tax Assets, Valuation Allowance         $ 0 $ 0 $ 0
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Earliest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2010        
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Latest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2014        
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] | Earliest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2010        
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] | Latest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2014        
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] | Earliest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2010        
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] | Latest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2014        
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] | Earliest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2008        
Foreign Tax Authority [Member] | Inland Revenue, Hong Kong [Member] | Latest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2014        
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2010        
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]              
Note 7 - Income Taxes (Details) [Line Items]              
Open Tax Year     2014