COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS (Details) - USD ($)	Apr. 30, 2015	Apr. 30, 2014
Costs incurred on uncompleted contracts	$ 32,008,307	$ 14,457,907
Estimated contract earnings	6,031,338	3,291,077
Gross Total	38,039,645	17,748,984
Less: Billings to date	38,965,672	18,766,199
Total	(926,027)	(1,017,215)
These amounts are included in the accompanying balance Sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	420,434	431,348
Billings in excess of costs and estimated earnings on uncompleted contracts	1,346,461	1,448,563
Total	$ (926,027)	$ (1,017,215)