Other Accrued Liabilities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Jul. 31, 2014
Other Accrued Liabilities [Abstract]
Allowance for project disallowances	$ 2,242,813	$ 2,673,351	$ 2,242,813	$ 2,673,351
Other	1,708,048		1,708,048		1,841,911
Total other accrued liabilities	3,950,861		3,950,861		4,235,262
Allowance for Project Disallowances [Roll Forward]
Balance at beginning of period	2,393,351	2,670,851	2,393,351	2,663,351
Net change during the period	(150,538)	2,500	(150,538)	10,000
Balance at end of period	2,242,813	2,673,351	2,242,813	2,673,351
Reduction of reserves recorded in prior fiscal years			100,000
Additions to revenues and contract adjustment			$ 100,000