COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($)	Jul. 31, 2015	Apr. 30, 2015
Costs incurred on uncompleted contracts	$ 32,181,891	$ 32,008,307
Estimated contract earnings	5,891,992	6,031,338
Gross Total	38,073,883	38,039,645
Less: Billings to date	39,021,941	38,965,672
Total	(948,058)	(926,027)
Costs and estimated earnings in excess of billings on uncompleted contracts	523,758	420,434
Billings in excess of costs and estimated earnings on uncompleted contracts	1,471,816	1,346,461
Total	$ (948,058)	$ (926,027)