Income (Loss) Per Share (Schedule Of Earnings (Loss) Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 25	$ (210)	$ (223)	$ (843)
Dividends paid and payable on preferred stock				(66)
Net income (loss) available to common stockholders	$ 25	$ (210)	$ (223)	$ (909)
Weighted-average shares of common stock outstanding, basic	16,384	16,384	16,384	15,841
Weighted-average shares of common stock outstanding, diluted	16,384	16,384	16,384	15,841
Basic	$ 0.00	$ (0.01)	$ (0.01)	$ (0.06)
Diluted	$ 0.00	$ (0.01)	$ (0.01)	$ (0.06)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities	1,149	1,521	1,149	1,521
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive securities	719	909	719	909