Lines of Credit (Details) (USD $)	6 Months Ended	12 Months Ended
	Jan. 31, 2014	Jul. 31, 2013
Lines of Credit [Abstract]
Outstanding cash draws, recorded as lines of credit on the accompanying condensed consolidated balance sheets	$ 2,011,374	$ 6,528,691
Outstanding letters of credit to support operations	3,075,171	3,080,938
Total amounts used under lines of credit	5,086,545	9,609,629
Remaining amounts available under lines of credit	29,282,455	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%