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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Oct. 01, 2015
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Reserve for Excess and Obsolete Inventories [Member]        
Valuation Allowances and Reserves, Charged to Cost and Expense   $ 2,400,000 $ 2,600,000 $ 7,100,000
Minimum [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment, Useful Life   30 years    
Minimum [Member] | Building Improvements [Member]        
Property, Plant and Equipment, Useful Life   5 years    
Minimum [Member] | Machinery, Equipment and Software [Member]        
Property, Plant and Equipment, Useful Life   3 years    
Minimum [Member]        
Standard Product Warranty Term   1 year    
Maximum [Member] | Land, Buildings and Improvements [Member]        
Property, Plant and Equipment, Useful Life   40 years    
Maximum [Member] | Building Improvements [Member]        
Property, Plant and Equipment, Useful Life   15 years    
Maximum [Member] | Machinery, Equipment and Software [Member]        
Property, Plant and Equipment, Useful Life   10 years    
Maximum [Member]        
Standard Product Warranty Term   3 years    
Goodwill, Impairment Loss $ 0      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   875,000 1,771,000  
Allowance for Doubtful Accounts Receivable, Current   $ 100,000 $ 200,000  
Depreciation   $ 4,200,000 4,800,000 $ 4,700,000
Number of Operating Segments   1    
Percentage of Revenue Recognized upon Customer Acceptance   20.00%    
Percentage of Revenue Recognized upon Shipment and Passage of Title   80.00%    
Deferred Revenue   $ 5,000,000 10,700,000  
Deferred Profit   3,730,000 6,941,000  
Foreign Currency Transaction Gain (Loss), Realized   1,400,000 2,000,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax   (21,772,000) (10,714,000)  
Increase (Decrease) in Accumulated Other Comprehensive Income   $ 11,000,000 $ 14,100,000