Note 10 - Segment Reporting (Detail) (USD $)	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Corporate Cost Annual Allocation (in Dollars)	$ 351,000
Segment Reporting Information, Intersegment Revenue (in Dollars)	0	0	0
Concentration Risk, Customer	two	one	two
Entity-Wide Revenue, Major Customer, Percentage		23.00%	31.00%
Foreign Sales, As A Percentage Of Entity Wide Sales	10.00%	13.00%	8.00%
Major Customer 1 [Member]
Entity-Wide Revenue, Major Customer, Percentage	17.00%
Major Customer 2 [Member]
Entity-Wide Revenue, Major Customer, Percentage	11.00%
Villa Sistemi Medicali S.p.A. [Member]
Assets of Disposal Group, Including Discontinued Operation (in Dollars)		32,006,000	25,354,000
Del Medical Imaging Corp [Member]
Assets of Disposal Group, Including Discontinued Operation (in Dollars)			$ 188,000