Earnings (Loss) Per Share (Schedule Of Earnings (Loss) Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ 188	$ (65)	$ 252	$ 157	$ (15,732)	$ 53	$ 795	$ (1,778)	$ 532	$ (16,662)	$ (16,665)
Dividends paid and payable on preferred stock									(400)	(334)
Net loss available to common stockholders									$ 132	$ (16,996)	$ (16,665)
Weighted-average shares of common stock outstanding, basic	14,718	14,718	14,718	14,718	14,718	14,713	14,657	14,601	14,718,000	14,672,000	13,552,000
Effect of dilutive securities									10,000
Weighted-average shares of common stock outstanding, diluted	14,736	14,718	14,729	14,718	14,718	14,713	14,809	14,601	14,728,000	14,672,000	13,552,000
Basic	$ 0.01	$ (0.01)	$ 0.01	$ 0.00	$ (1.08)	$ 0.00	$ 0.05	$ (0.12)	$ 0.01	$ (1.16)	$ (1.23)
Diluted	$ 0.01	$ (0.01)	$ 0.01	$ 0.00	$ (1.08)	$ 0.00	$ 0.04	$ (0.12)	$ 0.01	$ (1.16)	$ (1.23)