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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Oct. 01, 2015
Jun. 25, 2016
Jun. 27, 2015
Jun. 25, 2016
Jun. 27, 2015
Dec. 26, 2015
Allowance for Doubtful Accounts Receivable, Current   $ 100,000   $ 100,000   $ 100,000
Number of Operating Segments       1    
Goodwill and Intangible Asset Impairment $ 0          
Foreign Currency Transaction Gain (Loss), Realized   $ 300,000 $ 600,000 $ 800,000 $ 400,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   773,000 843,000 775,000 940,000  
Percentage of Revenue Recognized upon Customer Acceptance       20.00%    
Percentage of Revenue Recognized upon Shipment and Passage of Title       80.00%    
Deferred Revenue   $ 9,900,000   $ 9,900,000   5,000,000
Deferred Profit   6,876,000   6,876,000   3,730,000
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (19,640,000)   $ (19,640,000)   $ (21,772,000)