Revenue and Contract Receivables, net (Details) - USD ($)		3 Months Ended
		Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Jul. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed Contracts Receivable				$ 21,186,191	$ 22,915,726
Unbilled Contracts Receivable				21,832,654	25,488,331
Contracts Receivable, Gross				43,018,845	48,404,057
Allowance for doubtful accounts and contract adjustments		$ (5,480,561)	$ (6,126,854)	(5,480,561)	(5,537,901)
Total contract receivables, net				37,538,284	42,866,156
Contractual retainage balance included under billed contract receivable				$ 600,000	$ 500,000
Management anticipation for receivables collection		1 year
Contract receivables				12.00%	11.00%
Allowance for doubtful accounts receivables				89.00%	89.00%
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period		$ 5,537,901	6,126,854
Net increase (decrease) due to adjustments in the allowance for contract adjustments	[1]	(28,580)	300,016
Net increase (decrease) due to adjustments in the allowance for doubtful accounts	[2]	(28,760)	(31,813)
Balance at end of period		5,480,561	$ 6,395,057
United States, Canada and South America [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross				$ 37,875,933	$ 43,212,684
Allowance for doubtful accounts and contract adjustments		626,210		579,108	626,210
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period		(626,210)
Balance at end of period		(579,108)
Middle East and Africa [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross				5,033,912	5,066,789
Allowance for doubtful accounts and contract adjustments		4,894,453		4,894,453	4,894,453
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period		(4,894,453)
Balance at end of period		(4,894,453)
Asia [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross				109,000	124,584
Allowance for doubtful accounts and contract adjustments		17,238		7,000	$ 17,238
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period		(17,238)
Balance at end of period		$ (7,000)
Brazil [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total contract receivables, net				$ 1,900,000
Management anticipation for receivables collection		1 year

[1] Increases (decreases) to the allowance for contract adjustments on the condensed consolidated balance sheets are also recorded as (decreases) increases to revenue on the condensed consolidated statements of operations.

[2] Increases (decreases) to the allowance for doubtful accounts on the condensed consolidated balance sheets are also recorded as increases (decreases) to administrative and other indirect operating expenses on the condensed consolidated statements of operations.