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Income Taxes (Details 6) (USD $)	12 Months Ended
Income Taxes (Details 6) (USD $)	Jul. 31, 2013 item	Jul. 31, 2012
Income Taxes
Deferred tax assets related to foreign tax credits carryovers	$ 133,000	$ 85,000
Decrease in foreign tax credits carryovers	48,000
Number of Canadian subsidiaries with newly created foreign tax credits	1
Decrease in overall valuation allowances	967,000
Valuation allowances
Valuation allowances	308,000	1,275,000
BIOSAFE investment
Valuation allowances
Valuation allowances	$ 175,000	$ 175,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.