CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Statement of Cash Flows [Abstract]
Consolidated net loss	$ (11,922,444)	$ (9,725,893)
Depreciation and amortization	1,760,872	2,094,658
Loss from disposition of operations	1,027,637
Stock-based compensation	59,413	72,169
Provision for doubtful accounts	575,418	98,159
Amortization of debt issuance costs		92,319
Goodwill and intangible assets impairment		6,900,000
Change in the fair value of acquisition-related contingent consideration	83,628	178,430
Loss (gain) on sale of fixed assets	21,517	(69,612)
Deferred income taxes	4,465,111	(51,410)
Accounts receivable	(1,666,320)	2,622,567
Costs and estimated earnings in excess of billings on uncompleted contracts	1,585,824	2,463,170
Inventory	660,669	(408,992)
Prepaid expenses and other current assets	(458,182)	(1,178,988)
Income taxes receivable	1,113,802	(1,536,068)
Prepaid taxes	(78,514)	(379,751)
Other assets	172,385	23,638
Accounts payable and accrued expenses	2,906,785	(1,566,823)
Billings in excess of costs and estimated earnings on uncompleted contracts	1,237,318	472,413
Deferred revenue	103,313	80,693
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,648,232	180,679
Acquisition of property and equipment, net	(387,033)	(1,133,541)
Payment of acquisition related contingent consideration	(1,047,732)
Proceeds from sale of operations, net of transaction costs	1,701,062
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	266,297	(1,133,541)
FINANCING ACTIVITIES:
Debt issuance costs	(667,232)
Borrowings under lines of credit	3,103,830	1,064,432
Repayments under lines of credit	(7,000,000)
Repayments under loans payable, net	(10,176)	(56,076)
Repayments to joint venture partner, net	(411,399)	(71,058)
Repayments of capital lease obligations	(43,783)	(64,085)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(5,028,760)	873,213
Effect of exchange rate changes on cash	(18,251)	76,376
NET DECREASE IN CASH AND CASH EQUIVALENTS	(3,132,482)	(3,273)
CASH AND CASH EQUIVALENTS, BEGINNING OF THE PERIOD	4,879,106	5,584,309
CASH AND CASH EQUIVALENTS, END OF THE PERIOD	$ 1,746,624	$ 5,581,036