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Capital Lease (Details Textual) (USD $)
1 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2012
Installment
Apr. 30, 2012
Oct. 28, 2011
Capital Lease (Textual) [Abstract]        
Proceeds from lease of machinery and equipment       $ 3,500,000
Effective interest rate 5.76%      
Number of monthly installments   60    
Condition of lease qualifies as capital lease   Net present value of future lease payments exceed 90% of the fair market value of the leased machinery and equipment    
Percentage of fair market value for qualifying as capital lease   90.00%    
Current portion of capital lease obligation   430,000 418,000  
Amount of short term capital lease obligations in other non current liabilities   $ 2,600,000