PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Property, Plant and Equipment, Gross	$ 10,680,007	$ 12,940,531
Less accumulated depreciation and amortization	7,626,552	8,631,081
Property, Plant and Equipment, Net, Total	3,053,455	4,309,450
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	158,380	283,806
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 Equipment [Member]
Property, Plant and Equipment, Gross	698,251	975,351
Computer Equipment [Member] | Maximum [Member]
Estimated useful life (years)	3 years
Computer Equipment [Member] | Minimum [Member]
Estimated useful life (years)	2 years
Office Equipment [Member]
Property, Plant and Equipment, Gross	70,937	82,185
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	2,857,204	4,071,146
Vehicles [Member] | Maximum [Member]
Estimated useful life (years)	7 years
Vehicles [Member] | Minimum [Member]
Estimated useful life (years)	5 years
Machinery and Equipment [Member]
Estimated useful life (years)	5 years
Property, Plant and Equipment, Gross	6,078,779	7,126,392
Building [Member]
Estimated useful life (years)	39 years
Property, Plant and Equipment, Gross	454,321	0
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	$ 362,135	$ 401,651
Leasehold Improvements [Member] | Maximum [Member]
Estimated useful life (years)	3 years
Leasehold Improvements [Member] | Minimum [Member]
Estimated useful life (years)	2 years