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Income Taxes (Details Textual) - USD ($)
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Income Taxes (Textual) [Abstract]        
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0 $ 0 $ 0  
Deferred tax liability not established for undistributed earnings of non-US subsidiaries 1,000,000      
Net deferred tax assets 31,721,000 29,914,000    
Decrease in unrecognised tax benefits due to settlement of federal tax audit 200,000      
Unrecognized Tax Benefit to the income tax provision if it become recognizable 2,100,000      
Unrecognized Tax Benefit, related to stock-based compensation, state NOLs 1,000,000 0    
Unrecognized Tax Benefits 600,000 500,000    
Deferred Tax Assets, Valuation Allowance 0 0 $ 2,090,000 $ 2,691,000
Evolution Robotics, Inc. (ER) [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards 23,000,000      
Research Tax Credit Carryforward [Member] | Evolution Robotics, Inc. (ER) [Member]        
Income Taxes (Textual) [Abstract]        
Tax Credit Carryforward, Amount 2,200,000      
Investment Tax Credit Carryforward [Member]        
Income Taxes (Textual) [Abstract]        
Tax Credit Carryforward, Amount 300,000 700,000    
State and Local Jurisdiction [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards 8,000,000 15,100,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]        
Income Taxes (Textual) [Abstract]        
Tax Credit Carryforward, Amount 1,000,000 1,000,000    
State and Local Jurisdiction [Member]        
Income Taxes (Textual) [Abstract]        
Operating Loss Carryforwards 15,000,000 19,400,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]        
Income Taxes (Textual) [Abstract]        
Tax Credit Carryforward, Amount $ 9,300,000 $ 8,100,000