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, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 163	$ (878)	$ (210)	$ (633)	$ 188	$ (65)	$ 252	$ 157	$ (1,558)	$ 532	$ (16,662)
Dividends paid and payable on preferred stock									(66)	(400)	(334)
Net income (loss) available to common stockholders									$ (1,624)	$ 132	$ (16,996)
Weighted-average shares of common stock outstanding, basic	16,384	16,384	16,384	15,297	14,718	14,718	14,718	14,718	16,110,000	14,718,000	14,672,000
Effect of dilutive securities										10,000
Weighted-average shares of common stock outstanding, diluted	16,386	16,384	16,384	15,297	14,736	14,718	14,729	14,718	16,110,000	14,728,000	14,672,000
Basic	$ 0.01	$ (0.05)	$ (0.01)	$ (0.05)	$ 0.01	$ (0.01)	$ 0.01	$ 0.00	$ (0.10)	$ 0.01	$ (1.16)
Diluted	$ 0.01	$ (0.05)	$ (0.01)	$ (0.05)	$ 0.01	$ (0.01)	$ 0.01	$ 0.00	$ (0.10)	$ 0.01	$ (1.16)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of antidilutive securities									1,571,021	2,523,477	2,632,115
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of antidilutive securities									905,916	909,042	1,344,986
Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of antidilutive securities									278,539	1,666,667	1,666,667