Other Accrued Liabilities (Details) (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013
Other Accrued Liabilities [Abstract]
Allowance for project disallowances	$ 2,385,851	$ 2,746,974	$ 2,385,851	$ 2,746,974
Other	1,736,606		1,736,606		1,406,722
Total other accrued liabilities	4,122,457		4,122,457		4,070,073
Allowance for Project Disallowances [Roll Forward]
Balance at beginning of period	2,673,351	2,724,474	2,663,351	2,724,474
Reduction of reserves recorded in prior fiscal years	(300,000)	0	(300,000)	0
Net change during the period, recorded as a transfer of reserves from allowance for doubtful accounts and contract adjustments	12,500	22,500	22,500	22,500
Balance at end of period	$ 2,385,851	$ 2,746,974	$ 2,385,851	$ 2,746,974