Note 11 - Shareholders' Equity (Detail) - Stock option exercise prices (USD $)	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010	Aug. 01, 2009
OPTIONS OUTSTANDING, RANGE NUMBER OF OPTION SHARES	184,008	137,151	205,055	178,905
OPTIONS OUTSTANDING, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 29.00	$ 38.06	$ 36.00	$ 40.50
OPTIONS OUTSTANDING, WEIGHTED AVERAGE REMAINING LIFE	5 years 292 days
OPTIONS EXERCISABLE, SHARES EXERCISABLE	124,108	117,721	169,965
OPTIONS EXERCISABLE, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 38.33	$ 42.96	$ 41.00
OPTIONS EXERCISABLE, WEIGHTED AVERAGE REMAINING LIFE	4 years 73 days
$6.25 - $41.75 [Member]
OPTIONS OUTSTANDING, RANGE NUMBER OF OPTION SHARES	153,760
OPTIONS OUTSTANDING, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 16.36
OPTIONS OUTSTANDING, WEIGHTED AVERAGE REMAINING LIFE	6 years 109 days
OPTIONS EXERCISABLE, SHARES EXERCISABLE	93,860
OPTIONS EXERCISABLE, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 20.63
OPTIONS EXERCISABLE, WEIGHTED AVERAGE REMAINING LIFE	5 years 36 days
$50.00 – $82.50 [Member]
OPTIONS OUTSTANDING, RANGE NUMBER OF OPTION SHARES	4,400
OPTIONS OUTSTANDING, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 50.00
OPTIONS OUTSTANDING, WEIGHTED AVERAGE REMAINING LIFE	6 months
OPTIONS EXERCISABLE, SHARES EXERCISABLE	4,400
OPTIONS EXERCISABLE, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 50.00
OPTIONS EXERCISABLE, WEIGHTED AVERAGE REMAINING LIFE	6 months
$87.50 - $99.25 [Member]
OPTIONS OUTSTANDING, RANGE NUMBER OF OPTION SHARES	17,662
OPTIONS OUTSTANDING, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 93.85
OPTIONS OUTSTANDING, WEIGHTED AVERAGE REMAINING LIFE	1 year 292 days
OPTIONS EXERCISABLE, SHARES EXERCISABLE	17,662
OPTIONS EXERCISABLE, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 93.85
OPTIONS EXERCISABLE, WEIGHTED AVERAGE REMAINING LIFE	1 year 292 days
$100.00 - $125.00 [Member]
OPTIONS OUTSTANDING, RANGE NUMBER OF OPTION SHARES	8,186
OPTIONS OUTSTANDING, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 115.30
OPTIONS OUTSTANDING, WEIGHTED AVERAGE REMAINING LIFE	1 year 73 days
OPTIONS EXERCISABLE, SHARES EXERCISABLE	8,186
OPTIONS EXERCISABLE, WEIGHTED AVERAGE EXERCISE PRICE (in Dollars per share)	$ 115.30
OPTIONS EXERCISABLE, WEIGHTED AVERAGE REMAINING LIFE	1 year 73 days