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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Dec. 31, 2015
Mar. 29, 2015
Foreign Tax Authority [Member]            
Operating Loss Carryforwards         $ 12,400  
Domestic Tax Authority [Member]            
Operating Loss Carryforwards         74,400  
Income Tax Expense (Benefit) $ 33 $ 71 $ 121 $ 182    
Operating Loss Carryforwards         86,800  
Tax Credit Carryforward, Amount         1,600  
Operating Loss Carryforwards Amount Recorded in Equity Upon Realization         3,000  
Unrecognized Tax Benefits   $ 518   $ 518   $ 7,296
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities         $ 21,400,000