Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Royalties and license fees	$ 7,516	$ 6,610
Product sales	5,353	4,634
Research and development	982	672
Total revenue	13,851	11,916
Operating costs and expenses:
Product costs	1,959	1,590
Research and development	3,362	3,638
Selling, general and administrative	3,653	3,466
Total operating costs and expenses	8,974	8,694
Operating income from continuing operations	4,877	3,222
Other income:
Investment income, net	72	138
Other income, net	1,176	8
Other income	1,248	146
Income from continuing operations before income taxes	6,125	3,368
Income tax provision	(1,877)	(1,213)
Income from continuing operations	4,248	2,155
Discontinued operations:
Income from discontinued operations, net of income taxes		1,605
Loss on sale of discontinued operations, net of income taxes		(1,054)
Income from discontinued operations		551
Net income	$ 4,248	$ 2,706
Basic income per share:
Continuing operations	$ 0.29	$ 0.12
Discontinued operations	$ 0.00	$ 0.03
Net income	$ 0.29	$ 0.15
Diluted income per share:
Continuing operations	$ 0.29	$ 0.12
Discontinued operations	$ 0.00	$ 0.03
Net income	$ 0.29	$ 0.15
Weighted average number of shares outstanding:
Basic	14,655	17,476
Diluted	14,863	17,528