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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Oct. 01, 2015
Sep. 24, 2016
Sep. 26, 2015
Sep. 24, 2016
Sep. 26, 2015
Dec. 26, 2015
Employee Stock Option [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   707,000 857,000 752,000 912,000  
Allowance for Doubtful Accounts Receivable, Current   $ 100,000   $ 100,000   $ 100,000
Goodwill and Intangible Asset Impairment $ 0          
Number of Operating Segments       1    
Foreign Currency Transaction Gain (Loss), Realized   (300,000) $ 1,500,000 $ (1,000,000) $ 1,100,000  
Percentage of Revenue Recognized upon Customer Acceptance       20.00%    
Percentage of Revenue Recognized upon Shipment and Passage of Title       80.00%    
Deferred Revenue   6,400,000   $ 6,400,000   5,000,000
Deferred Profit   5,726,000   5,726,000   3,730,000
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (19,084,000)   $ (19,084,000)   $ (21,772,000)