Note 10 - Segment Reporting (Detail) - Net sales by geographic areas (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Amount (in Dollars)	$ 11,438	$ 10,783	$ 12,473
Percentage	100.00%	100.00%	100.00%
United States [Member]
Amount (in Dollars)	10,291	9,357	11,500
Percentage	90.00%	87.00%	92.00%
Canada [Member]
Amount (in Dollars)	85	81	50
Percentage	1.00%	1.00%	0.00%
Europe [Member]
Amount (in Dollars)	374	666	306
Percentage	3.00%	6.00%	3.00%
Far East [Member]
Amount (in Dollars)	392	635	548
Percentage	3.00%	6.00%	4.00%
Africa, Middle East and Australia [Member]
Amount (in Dollars)	$ 296	$ 44	$ 69
Percentage	3.00%	0.00%	1.00%

Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 22

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a, b, c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_SegmentReportingInformationRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration