NOTES PAYABLE Notes Payable (Narrative) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Senior Notes Issued November 2010
Debt Instrument
Face amount	$ 18,500,000
Interest rate	3.96%
Minimum overdue financial obligation considered as default	$ 5,000,000
Senior Notes Issued December 2005
Debt Instrument
Face amount	$ 15,000,000
Interest rate	5.89%
Maturity date	Oct. 15, 2015
Minimum overdue financial obligation considered as default	$ 5,000,000
Line of Credit, BMO Harris
Debt Instrument
Initiation date	Dec. 04, 2014
Expiration date	Dec. 04, 2019
Maximum borrowing capacity	$ 25,000,000
Maximum borrowing capacity for foreign letters of credit	$ 5,000,000
Variable interest rate, prime based	3.50%
Variable interest rate, LIBOR based	1.70%
Line of credit amount outstanding	$ 0	$ 0
Minimum overdue financial obligation considered as default	$ 1,000,000