Note 4 - Inventories (Detail) - Allowance for excess and obsolete inventories (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Allowance for excess and obsolete inventories, BALANCE AT BEGINNING OF YEAR	$ 1,175	$ 697	$ 900
Allowance for excess and obsolete inventories, CHARGED TO COSTS AND EXPENSE		622	144
Allowance for excess and obsolete inventories, DEDUCTIONS	119	144	347
Allowance for excess and obsolete inventories, BALANCE AT END OF YEAR	$ 1,056	$ 1,175	$ 697