Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Royalties and license fees	$ 7,465	$ 7,516
Product sales	5,400	5,353
Research and development	1,018	982
Total revenue	13,883	13,851
Operating costs and expenses:
Product costs	2,004	1,959
Research and development	3,699	3,362
Selling, general and administrative	3,851	3,653
Total operating costs and expenses	9,554	8,974
Operating income	4,329	4,877
Other income:
Investment income, net	86	72
Gain on sale of strategic investment	681	1,174
Other investment capital gains		2
Other income	767	1,248
Income before income taxes	5,096	6,125
Income tax provision	(1,466)	(1,877)
Net income	$ 3,630	$ 4,248
Basic net income per share	$ 0.26	$ 0.29
Diluted net income per share	$ 0.26	$ 0.29
Weighted average number of shares outstanding:
Basic	13,756	14,655
Diluted	14,009	14,863