Earnings (Loss) Per Share (Schedule Of Earnings (Loss) Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ (633)	$ 157
Dividends paid and payable on preferred stock	(66)	(101)
Net income (loss) available to common stockholders	$ (699)	$ 56
Weighted-average shares of common stock outstanding, basic	15,297	14,718
Weighted-average shares of common stock outstanding, diluted	15,297	14,718
Basic	$ (0.05)	$ 0.00
Diluted	$ (0.05)	$ 0.00