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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Details) - Accounts Receivable (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts and sales discounts $ (887) $ (978)
Accounts receivable, net 59,955 55,726
Billed Revenues [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, current 42,321 35,415
Unbilled Revenues [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, current 5,901 7,895
Work In Progress [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, current $ 12,620 $ 13,394