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PROPERTY AND EQUIPMENT (Details) (USD $)
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Property, Plant and Equipment, Gross $ 7,832,312 $ 8,921,746
Less accumulated depreciation 6,051,792 6,395,108
Property, Plant and Equipment, Net 1,780,520 2,526,638
Furniture and Fixtures [Member]
   
Property, Plant and Equipment, Gross 94,260 138,037
Furniture and Fixtures [Member] | Maximum [Member]
   
Estimated useful life (years) 7 years  
Furniture and Fixtures [Member] | Minimum [Member]
   
Estimated useful life (years) 5 years  
Computer and software [Member]
   
Property, Plant and Equipment, Gross 299,055 546,832
Computer and software [Member] | Maximum [Member]
   
Estimated useful life (years) 3 years  
Computer and software [Member] | Minimum [Member]
   
Estimated useful life (years) 2 years  
Office Equipment [Member]
   
Property, Plant and Equipment, Gross 16,814 16,872
Office Equipment [Member] | Maximum [Member]
   
Estimated useful life (years) 7 years  
Office Equipment [Member] | Minimum [Member]
   
Estimated useful life (years) 5 years  
Vehicles [Member]
   
Property, Plant and Equipment, Gross 1,281,456 1,558,460
Vehicles [Member] | Maximum [Member]
   
Estimated useful life (years) 7 years  
Vehicles [Member] | Minimum [Member]
   
Estimated useful life (years) 5 years  
Machinery and Equipment [Member]
   
Property, Plant and Equipment, Gross 5,401,436 5,898,291
Estimated useful life (years) 5 years  
Building [Member]
   
Property, Plant and Equipment, Gross 447,603 454,321
Estimated useful life (years) 39 years  
Leasehold Improvements [Member]
   
Property, Plant and Equipment, Gross $ 291,688 $ 308,933
Leasehold Improvements [Member] | Maximum [Member]
   
Estimated useful life (years) 3 years  
Leasehold Improvements [Member] | Minimum [Member]
   
Estimated useful life (years) 2 years