Other Accrued Liabilities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013
Other Accrued Liabilities [Abstract]
Allowance for project disallowances	$ 2,673,351	$ 2,724,474	$ 2,673,351	$ 2,724,474
Other	1,708,349		1,708,349		1,406,722
Total other accrued liabilities	4,381,700		4,381,700		4,070,073
Allowance for Project Disallowances [Roll Forward]
Balance at beginning of period	2,670,851	2,723,974	2,663,351	2,724,474
Net change during the period, recorded as a transfer of reserves from allowance for doubtful accounts and contract adjustments	2,500	500	10,000	0
Balance at end of period	$ 2,673,351	$ 2,724,474	$ 2,673,351	$ 2,724,474