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, 2012	Jul. 31, 2011
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ 157	$ (1,778)
Dividends paid and payable on preferred stock	(101)	(34)
Net loss available to common stockholders	$ 56	$ (1,812)
Weighted-average shares of common stock outstanding, basic	14,718	14,601
Effect of dilutive securities
Weighted-average shares of common stock outstanding, diluted	14,718	14,601
Basic	$ 0.00	$ (0.12)
Diluted	$ 0.00	$ (0.12)