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Note 4 - Property and Equipment, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Depreciation     $ 15,100 $ 15,200 $ 15,800
Asset Impairment Charges     104 2,674 296
Cost of Sales [Member]          
Asset Impairment Charges   $ 2,300      
Cost of Sales [Member] | Maximum [Member]          
Asset Impairment Charges $ 100        
Selling, General and Administrative Expenses [Member] | Property And Equipment [Member]          
Impairment of Long-Lived Assets to be Disposed of     $ 100 $ 400 $ 300