Quarterly Results Of Operations (Schedule Of Quarterly Results Of Operations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2015	Apr. 30, 2014
Quarterly Results Of Operations [Abstract]
Total revenues	$ 6,108	$ 5,694	$ 6,652	$ 6,662	$ 7,370	$ 7,888	$ 7,736	$ 7,964	$ 25,116	$ 30,958
Income from operations	(417)	(361)	369	58	506	(278)	(34)	(24)	(351)	170
Net income (loss)	$ (541)	$ (923)	$ 25	$ (247)	$ 163	$ (878)	$ (210)	$ (633)	$ (1,686)	$ (1,558)
Loss per share:
Basic	$ (0.03)	$ (0.06)		$ (0.02)	$ 0.01	$ (0.05)	$ (0.01)	$ (0.05)	$ (0.10)	$ (0.10)
Diluted	$ (0.03)	$ (0.06)		$ (0.02)	$ 0.01	$ (0.05)	$ (0.01)	$ (0.05)	$ (0.10)	$ (0.10)
Weighted-average shares used in computing Loss per share:
Basic	16,384	16,384	16,384	16,384	16,384	16,384	16,384	15,297	16,384	16,110
Diluted	16,384	16,384	16,384	16,384	16,386	16,384	16,384	15,297	16,384	16,110