Quarterly Results of Operations (Schedule Of Quarterly Results Of Operations) (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, 2011	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 9,770	$ 10,440	$ 10,345	$ 9,638	$ 9,811	$ 11,069	$ 11,075	$ 11,514		$ 40,193	$ 43,469	$ 46,993
Income (loss) from operations	762	367	902	284	(15,706)	604	1,198	845		2,315	(13,059)	(13,731)
Net income (loss)	188	(65)	252	157	(15,732)	53	795	(1,778)		532	(16,662)	(16,665)
Income (loss) per share:
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)
Weighted-average shares used in computing income (loss) per share:
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
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
Impairments of goodwill and intangible assets					$ 15,000				$ 16,000		$ 15,047	$ 15,964