6. STOCKHOLDERS' EQUITY (Details - Dividends declared)	9 Months Ended
	Jan. 31, 2016 $ / shares
Declared 06-05-2015 [Member]
Declaration date	Jun. 05, 2015
Dividend per share	$ .65625
Annualized Percentage Rate	10.50%
Liquidation preference	$ 25.00
Accrual period	4/1/2015 - 6/30/2015
Record date	Jun. 19, 2015
Payment date	Jul. 01, 2015
Declared 09-08-2015 [Member]
Declaration date	Sep. 08, 2015
Dividend per share	$ .65625
Annualized Percentage Rate	10.50%
Liquidation preference	$ 25.00
Accrual period	7/1/2015-9/30/2015
Record date	Sep. 18, 2015
Payment date	Oct. 01, 2015
Declared 12-07-2015 [Member]
Declaration date	Dec. 07, 2015
Dividend per share	$ .65625
Annualized Percentage Rate	10.50%
Liquidation preference	$ 25.00
Accrual period	10/1/2015 - 12/31/2015
Record date	Dec. 18, 2015
Payment date	Jan. 04, 2016