COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015
Costs incurred on uncompleted contracts	$ 28,884,776	$ 32,008,307
Estimated contract earnings	4,367,463	6,031,338
Gross Total	33,252,239	38,039,645
Less: Billings to date	34,253,318	38,965,672
Total	(1,001,079)	(926,027)
Costs and estimated earnings in excess of billings on uncompleted contracts	357,210	420,434
Billings in excess of cost and estimated earnings on uncompleted contracts	1,358,289	1,346,461
Total	$ (1,001,079)	$ (926,027)

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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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