Stockholder's Investment (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Schedule of Capital Units
Amount	$ 548	$ 548
Preferred Stock, $.01 par [Member]
Schedule of Capital Units
Preferred Stock, shares authorized	5,000,000	5,000,000
Cumulative Preferred Stock: 6% Cumulative [Member]
Schedule of Capital Units
Preferred Stock, shares authorized	5,000	5,000
1972 Series [Member]
Schedule of Capital Units
Preferred Stock, shares authorized	10,000	10,000
1979 Series [Member]
Schedule of Capital Units
Preferred Stock, shares authorized	30,000	30,000
Class A Nonvoting Common Stock [Member]
Schedule of Capital Units
Common Stock, shares authorized	100,000,000	100,000,000
Common stock, shares Issued	51,261,487	51,261,487
Amount	513	513
Class B common stock [Member]
Schedule of Capital Units
Common Stock, shares authorized	10,000,000	10,000,000
Common stock, shares Issued	3,538,628	3,538,628
Amount	$ 35	$ 35