Segment Reporting (Details) - Reportable Geographical Components [Member] - USD ($)		3 Months Ended		9 Months Ended
		Apr. 30, 2016	May 02, 2015	Apr. 30, 2016	May 02, 2015	Jul. 31, 2015
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 18,785,081	$ 21,577,386	$ 60,419,854	$ 60,995,999
Long-Lived Assets		5,193,663		5,193,663		$ 5,745,728
Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	[1]	6,432,959	8,818,350	19,502,927	30,819,913
Long-Lived Assets		1,147,117		1,147,117		$ 1,367,966
Peru [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		2,300,000	5,000,000	8,200,000	17,300,000
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		1,200,000	1,400,000	3,200,000	6,700,000
Chile [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 1,900,000	$ 1,700,000	$ 5,800,000	$ 4,800,000

[1] Significant foreign revenues included revenues in Peru ($2.3 million and $5.0 million for the three months ended April 30, 2016 and May 2, 2015, respectively, and $8.2 million and $17.3 million for the nine months ended April 30, 2016 and May 2, 2015, respectively), Brazil ($1.2 million and $1.4 million for the three months ended April 30, 2016 and May 2, 2015, respectively, and $3.2 million and $6.7 million for the nine months ended April 30, 2016 and May 2, 2015, respectively) and Chile ($1.9 million and $1.7 million for the three months ended April 30, 2016 and May 2, 2015, respectively, and $5.8 million and $4.8 million for the nine months ended April 30, 2016 and May 2, 2015, respectively).