CONCENTRATIONS (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Apr. 30, 2015
Concentration Risk [Line Items]
Contract Receivable Retainage, Total	$ 1,243,000		$ 1,243,000		$ 1,119,000
Accounts Receivable [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			27.00%
Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			20.00%
Sales Revenue, Net [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		67.00%	23.00%	59.00%
Sales Revenue, Net [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	25.00%		11.00%