Revenue and Contract Receivables, net (Details) - USD ($)		3 Months Ended		9 Months Ended
		Apr. 30, 2016	May 02, 2015	Apr. 30, 2016	May 02, 2015	Apr. 30, 2016	Jan. 30, 2016	Jul. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed Contracts Receivable						$ 20,926,430		$ 22,915,726
Unbilled Contracts Receivable						19,330,498		25,904,691
Contracts Receivable, Gross						40,256,928		48,820,417
Allowance for doubtful accounts and contract adjustments		$ (5,798,094)	$ (6,359,531)	$ (5,798,094)	$ (6,507,869)	(5,798,094)	$ (6,119,050)	(5,954,261)
Total contract receivables, net						34,458,834		42,866,156
Contractual retainage balance included under billed contract receivable						$ 800,000		$ 500,000
Management anticipation for receivables collection				1 year
Contract receivables						13.00%		11.00%
Allowance for doubtful accounts receivables						84.00%		82.00%
Additional allowance for doubtful accounts receivables		100,000		$ 300,000
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period			6,359,531	5,954,261	6,507,869
Net increase (decrease) due to adjustments in the allowance for contract adjustments	[1]	(427,968)	(63,401)	(577,548)	180,278
Net increase (decrease) due to adjustments in the allowance for doubtful accounts	[2]	107,012	12,866	421,381	(379,151)
Balance at end of period		5,798,094	6,308,996	5,798,094	6,308,996
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additional allowance for doubtful accounts receivables			$ 100,000		$ 100,000
United States, Canada and South America [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross						$ 35,150,132		$ 43,629,044
Allowance for doubtful accounts and contract adjustments		903,641		903,641		903,641		1,042,570
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period				(1,042,570)
Balance at end of period		(903,641)		(903,641)
Middle East and Africa [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross						5,061,796		5,066,789
Allowance for doubtful accounts and contract adjustments		4,894,453		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)		(4,894,453)
Asia [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Gross						45,000		124,584
Allowance for doubtful accounts and contract adjustments		0		0		$ 0		$ 17,238
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period				(17,238)
Balance at end of period		$ 0		$ 0

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

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