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Note 9 - Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Total income tax provision $ 88 $ 111  
Net operating loss carryforward     $ 86,800
Net operating loss carryforward - domestic     74,400
Net operating loss carryforward - foreign     12,400
Tax credit carryforwards     1,600
Net operating loss carryforward for which a benefit will be recorded in capital when realized     $ 3,000
Unrecognized tax benefits to uncertain tax positions   7,296  
Unrecognized tax benefits related to settlement of examinations   $ 21,400