Note 4 - Accounts Receivable (Detail) - Accounts receivable (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Allowance for doubtful accounts and sales discounts	$ (1,113)	$ (1,207)
Accounts receivable, net	49,499	43,706
Billed Revenues [Member]
Accounts receivable, current	31,508	26,600
Unbilled Revenues [Member]
Accounts receivable, current	5,358	4,761
Work In Progress [Member]
Accounts receivable, current	$ 13,746	$ 13,552