Note 4 - Accounts Receivable (Details) - Accounts Receivable (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts and sales discounts	$ (978)	$ (1,207)
Accounts receivable, net	54,828	43,706
Billed Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	36,131	26,600
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	5,839	4,761
Work In Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	$ 13,836	$ 13,552