Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 22,387	$ 19,105
Less accumulated depreciation	11,868	10,320
Property and equipment, net	$ 10,519	8,785
Percentage of long-lived assets outside United States (in hundredths)	25.00%
Depreciation expense	$ 1,621	1,173	$ 1,123
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,488	984
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,912	6,650
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,940	9,023
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,703	1,182
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,132	1,113
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 212	$ 153