Note 4 - Accounts Receivable (Details) - Accounts receivable (USD $) In Thousands, unless otherwise specified	Jun. 29, 2013	Dec. 29, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts and sales discounts	$ (1,128)	$ (1,207)
Accounts receivable, net	49,089	43,706
Billed Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	30,927	26,600
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	5,426	4,761
Work In Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, current	$ 13,864	$ 13,552