6. STOCKHOLDERS EQUITY (Details - Preferred Stock Dividends) (Series E Preferred Stock [Member], USD $)	9 Months Ended
	Jan. 31, 2015
Dividend paid July 1, 2014 [Member]
Declaration Date	Jun. 10, 2014
Dividend per share	$ 0.65625
Annualized percentage rate	10.50%
Liquidation preference	$ 25.00
Accrual period	4/1/2014-6/30/2014
Record date	Jun. 20, 2014
Payment date	Jul. 01, 2014
Dividend paid October 1, 2014 [Member]
Declaration Date	Sep. 08, 2014
Dividend per share	$ 0.65625
Annualized percentage rate	10.50%
Liquidation preference	$ 25.00
Accrual period	7/1/2014-9/30/2014
Record date	Sep. 19, 2014
Payment date	Oct. 01, 2014
Dividend paid January 2, 2015 [Member]
Declaration Date	Dec. 09, 2014
Dividend per share	$ 0.65625
Annualized percentage rate	10.50%
Liquidation preference	$ 25.00
Accrual period	10/1/2014-12/31/2014
Record date	Dec. 19, 2014
Payment date	Jan. 02, 2015