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Acquisitions (Details) (USD $)
 3 Months Ended
Oct. 31, 2012
Jul. 31, 2013
Dec. 20, 2012
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 357,000
Accounts receivable     1,133,000
Other current assets     23,000
Property, plant and equipment     480,000
Goodwill 0 4,055,000 4,055,000
Intangible Assets 0 9,592,000 9,592,000
Other assets     101,000
Accounts payable     (302,000)
Other current liabilities     (1,492,000)
Deferred tax liabilities     (3,357,000) [1]
Other long-term liabilities     (155,000)
Total identifiable net assets     10,435,000
Business Acquisition, Cost of Acquired Entity, Transaction Costs     100,000
Equity Method Investment, Ownership Percentage     39.00%
Common Stock, Shares, Issued 185,856,123 192,054,464  
Noncontrolling Interest, Ownership Percentage by Controlling Owners     61.00%
Equity Method Investment, Other than Temporary Impairment $ 3,600,000    
Versa Acquisition [Member]
      
Business Acquisition [Line Items]      
Common Stock, Shares, Issued     3,500,000
[1] Classified in Long-term debt and other liabilities on the consolidated balance sheets.