Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Intangible Assets - Components of finite-lived intangible assets acquired (Details)

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Summary of Significant Accounting Policies - Intangible Assets - Components of finite-lived intangible assets acquired (Details) (USD $)
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Components of finite-lived intangible assets acquired    
Total gross carrying amount $ 1,559,000 $ 1,559,000
Accumulated amortization 1,559,000 1,426,000
Net carrying amount 0 133,000
Customer Relationships
   
Components of finite-lived intangible assets acquired    
Total gross carrying amount 758,000 758,000
Accumulated amortization 758,000 758,000
Net carrying amount 0 0
Weighted Average Life 2 years 2 years
Trade Names
   
Components of finite-lived intangible assets acquired    
Total gross carrying amount 733,000 733,000
Accumulated amortization 733,000 600,000
Net carrying amount 0 133,000
Weighted Average Life 5 years 5 years
Noncompete Agreement
   
Components of finite-lived intangible assets acquired    
Total gross carrying amount 68,000 68,000
Accumulated amortization 68,000 68,000
Net carrying amount $ 0 $ 0
Weighted Average Life 4 years 4 years