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COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) (USD $)	Apr. 30, 2014	Apr. 30, 2013
Costs incurred on uncompleted contracts	$ 14,457,907	$ 61,281,224
Provision for loss on uncompleted contracts	0	(11,148)
Estimated contract earnings (losses)	3,291,077	(1,850,297)
Gross Total	17,748,984	59,419,779
Less: Billings to date	18,766,199	60,434,797
Total	(1,017,215)	(1,015,018)
Costs and estimated earnings in excess of billings on uncompleted contracts	431,348	329,141
Billings in excess of cost and estimated earnings on uncompleted contracts	1,448,563	1,344,159
Total	$ (1,017,215)	$ (1,015,018)

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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