Billings in Excess of Costs (Details) - USD ($)	Jul. 31, 2016	Jul. 31, 2015
Costs incurred on uncompleted contracts	$ 853,787	$ 2,033,840
Billings to date	(143,135)	(5,523,616)
Billings in Excess of Cost		(3,489,776)
Included in the accompanying balance sheets as follows:
Costs in excess of billings on uncompleted contracts	710,652	0
Billings on uncompleted contracts in excess of costs	0	(3,489,776)
Billings in Excess of Cost, Current	$ 0	$ (3,489,776)