5. STOCKHOLDERS EQUITY (Details - Preferred Stock Dividends) - Series E Preferred Stock [Member] - $ / shares		12 Months Ended
		Apr. 30, 2015	Apr. 30, 2014
Dividend paid April 1, 2014 [Member]
Declaration Date			Mar. 11, 2014
Dividend per share	[1]		$ 0.29890
Annualized percentage rate			10.50%
Liquidation preference			$ 25.00
Accrual period			2/19/2014 - 3/31/2014
Record date			Mar. 21, 2014
Payment date			Apr. 01, 2014
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
Dividend paid April 1, 2015 [Member]
Declaration Date		Mar. 10, 2015
Dividend per share		$ 0.65625
Annualized percentage rate		10.50%
Liquidation preference		$ 25.00
Accrual period		1/1/2015 - 3/31/2015
Record date		Mar. 20, 2015
Payment date		Apr. 01, 2015

[1] Dividend per share was pro-rated for the initial accrual period starting February 19, 2014.