Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill - Components of finite-lived intangible assets acquired (Details)

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Intangible Assets and Goodwill - Components of finite-lived intangible assets acquired (Details) (USD $)
 3 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Components of finite-lived intangible assets acquired    
Total gross carrying amount $ 1,559,000 $ 1,559,000
Less accumulated amortization expense 1,303,000 1,262,000
Net intangible assets 256,000 297,000
Customer Relationships
    
Components of finite-lived intangible assets acquired    
Total gross carrying amount 758,000 758,000
Net intangible assets   758,000
Weighted Average Life 2 years  
Noncompete Agreements
    
Components of finite-lived intangible assets acquired    
Total gross carrying amount 68,000 68,000
Net intangible assets   68,000
Weighted Average Life 4 years  
Trade Names
    
Components of finite-lived intangible assets acquired    
Total gross carrying amount 733,000 733,000
Net intangible assets   $ 733,000
Weighted Average Life 5 years