Income Taxes (Details 4) (USD $)	Jul. 31, 2013	Jul. 31, 2012
Current deferred tax assets:
Accrued expenses	$ 2,337,000	$ 2,158,000
Inventories	1,149,000	1,323,000
Accounts receivable	676,000	429,000
Foreign NOLs	76,000
Subtotal	4,238,000	3,910,000
Valuation allowance	(109,000)	(111,000)
Total current deferred tax assets	4,129,000	3,799,000
Non-current deferred tax assets:
Other long-term liabilities	527,000	527,000
Stock-based compensation	2,138,000	1,811,000
Capital investment	175,000	175,000
Foreign tax credit	133,000	85,000
Domestic NOLs	83,000	111,000
Foreign NOLs		977,000
Subtotal	3,056,000	3,686,000
Valuation allowance	(199,000)	(1,164,000)
Net non-current deferred tax assets	2,857,000	2,522,000
Non-current deferred tax liabilities:
Property and equipment	(6,310,000)	(6,496,000)
Intangible assets	(9,840,000)	(7,214,000)
Goodwill	(7,893,000)	(5,551,000)
Cumulative translation adjustment		(3,130,000)
Tax on unremitted foreign earnings		(25,000)
Gross non-current deferred tax liabilities	(24,043,000)	(22,416,000)
Net non-current deferred tax liabilities	$ (21,186,000)	$ (19,894,000)