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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended
Oct. 01, 2015
Mar. 26, 2016
Mar. 28, 2015
Dec. 26, 2015
Allowance for Doubtful Accounts Receivable, Current   $ 100,000   $ 100,000
Number of Operating Segments   1    
Foreign Currency Transaction Gain (Loss), Realized   $ (500,000) $ 200,000  
Percentage of Revenue Recognized upon Customer Acceptance   20.00%    
Percentage of Revenue Recognized upon Shipment and Passage of Title   80.00%    
Deferred Revenue   $ 7,300,000   5,000,000
Deferred Profit   5,564,000   3,730,000
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (19,284,000)   $ (21,772,000)
Goodwill and Intangible Asset Impairment $ 0