6. STOCKHOLDERS' EQUITY (Details - Dividends) - Series E Preferred Stock [Member]	6 Months Ended
	Oct. 31, 2016 USD ($) $ / shares
June 2, 2016 [Member]
Declaration date	Jun. 02, 2016
Dividend per share | $ / shares	$ 0.65625
Annualized percentage rate	10.50%
Liquidation preference | $	$ 25
Accrual period	4/1/2016-6/30/2016
Record date	Jun. 17, 2016
Payment date	Jul. 01, 2016
September 6, 2016 [Member]
Declaration date	Sep. 06, 2016
Dividend per share | $ / shares	$ 0.65625
Annualized percentage rate	10.50%
Liquidation preference | $	$ 25
Accrual period	7/1/2016-9/30/2016
Record date	Sep. 16, 2016
Payment date	Oct. 03, 2016