Lines of Credit (Details) (USD $)	3 Months Ended	12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013
Line of Credit Facility [Line Items]
Outstanding cash draws, recorded as lines of credit on the accompanying consolidated balance sheets	$ 6,500,000	$ 6,528,691
Outstanding letters of credit to support operations	2,872,632	3,080,938
Total amounts used under lines of credit	9,372,632	9,609,629
Remaining amounts available under lines of credit	24,996,368	24,759,371
Total approved unsecured lines of credit	$ 34,369,000	$ 34,369,000
Interest rate, minimum (in hundredths)	2.50%	2.50%
Interest rate, maximum (in hundredths)	5.00%	5.00%