Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Statement of Cash Flows [Abstract]
Consolidated net loss	$ (1,639,945)	$ (6,404,635)
Depreciation and amortization	1,180,549	1,456,321
Loss from disposition of operations	1,027,637
Stock-based compensation	44,320	52,782
Provision for doubtful accounts	36,967	69,887
Amortization of debt issuance costs	38,004	6,425
Goodwill and intangible assets impairment		4,300,000
Change in the fair value of acquisition-related contingent consideration	83,628	136,645
Gain on sale of fixed assets	(18,041)	(64,275)
Deferred income taxes	(90,895)	34,088
Accounts receivable	(4,366,834)	(1,274,983)
Costs and estimated earnings in excess of billings on uncompleted contracts	346,399	1,866,567
Inventory	162,277	(388,260)
Prepaid expenses and other current assets	(962,671)	(841,165)
Income taxes receivable	(18,775)
Prepaid taxes	41,780	(1,190,955)
Other assets	2,332	37,988
Accounts payable and accrued expenses	6,507,970	295,167
Billings in excess of costs and estimated earnings on uncompleted contracts	598,853	397,534
Deferred revenue	(117,280)	116,188
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	2,856,275	(1,394,681)
Acquisition of property and equipment, net	(311,248)	(618,874)
Proceeds from sale of operations, net of transaction costs	1,701,062
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,389,814	(618,874)
FINANCING ACTIVITIES:
(Repayments) borrowings under lines of credit	(3,500,000)	2,000,000
Borrowings (repayments) under loans payable, net	31,463	(41,835)
(Repayments) borrowings to joint venture partner, net	(404,229)	236,990
Repayments of capital lease obligations	(32,576)	(44,808)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(3,905,342)	2,150,347
Effect of exchange rate changes on cash	(12,808)	64,372
NET DECREASE IN CASH AND CASH EQUIVALENTS	327,939	201,164
CASH AND CASH EQUIVALENTS, BEGINNING OF THE PERIOD	4,879,106	5,584,309
CASH AND CASH EQUIVALENTS, END OF THE PERIOD	$ 5,207,045	$ 5,785,473