GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended	12 Months Ended								12 Months Ended
	Apr. 30, 2013	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013 Wireless Communication [Member]	Apr. 30, 2012 Wireless Communication [Member]	Apr. 30, 2011 Wireless Communication [Member]	Apr. 30, 2013 Specialty Construction [Member]	Apr. 30, 2012 Specialty Construction [Member]	Apr. 30, 2011 Specialty Construction [Member]	Apr. 30, 2013 Electrical Power [Member]	Apr. 30, 2012 Electrical Power [Member]
Beginning balance		$ 1,930,826	$ 2,044,856	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (1,930,826)	$ 2,044,856
Foreign currency translation adjustments		5,233	(114,030)							5,233	(114,030)
Goodwill and intangible assets impairment	1,936,000	1,936,059	20,167							(1,936,059)
Ending Balance	$ 0	$ 0	$ 1,930,826	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (1,930,826)