INCOME TAXES: (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Operating Loss Carryforwards State Subject To Expiration Current	$ 106,973,000
Operating Loss Carryforwards State Subject To Expiration In One Years	0
Operating Loss Carryforwards State Subject To Expiration In Two Years	0
Operating Loss Carryforwards State Subject To Expiration In Three Years	0
Operating Loss Carryforwards State Subject To Expiration In Four Years	0
Operating Loss Carryforwards State Subject To Expiration In five Years	1,969,000
Operating Loss Carryforwards State Subject To Expiration In Thereafter	105,004,000
Federal Operating Loss Carryforwards	14,416,000
Business Acquisition Purchase Price Allocation Goodwill	9,148,000
Federal Operating Loss Carryforwards Reduced Amount	2,400,000
Liability for Uncertain Tax Positions, Reduced Amount	160,000
Interest Liability On Unrecognized Tax Benefits		$ 0
Tax Credit Adjustments	0	134,000
Unrecognized Tax Benefits, Period Increase (Decrease)	58,000	58,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0	0
Deferred Tax Assets, Valuation Allowance	3,657,000	2,627,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,030,000	$ 359,000