Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Royalties and license fees	$ 7,385	$ 7,827	$ 22,179	$ 22,294
Product sales	6,067	5,577	16,632	16,688
Research and development	1,164	885	3,292	2,853
Total revenue	14,616	14,289	42,103	41,835
Operating costs and expenses:
Product costs	2,037	1,990	5,737	5,894
Research and development	3,655	4,009	11,488	11,145
Selling, general and administrative	3,591	4,052	11,736	11,552
Total operating costs and expenses	9,283	10,051	28,961	28,591
Operating income from continuing operations	5,333	4,238	13,142	13,244
Other income (loss):
Investment income, net	42	60	194	187
Impairment loss on strategic investment				(129)
Gain on sales of strategic investments	28		709	119
Other income, net		2	125	1,341
Other income, net	70	62	1,028	1,518
Income from continuing operations before income taxes	5,403	4,300	14,170	14,762
Income tax provision	(1,729)	(1,122)	(4,407)	(3,916)
Income from continuing operations	3,674	3,178	9,763	10,846
(Loss) income from discontinued operations, net of income taxes	(76)	(47)	(76)	635
Net income	$ 3,598	$ 3,131	$ 9,687	$ 11,481
Basic income (loss) per share:
Continuing operations	$ 0.27	$ 0.22	$ 0.72	$ 0.74
Discontinued operations	$ (0.01)	$ 0.00	$ (0.01)	$ 0.04
Net income	$ 0.26	$ 0.22	$ 0.71	$ 0.79
Diluted income (loss) per share:
Continuing operations	$ 0.27	$ 0.22	$ 0.70	$ 0.73
Discontinued operations	$ (0.01)	$ 0.00	$ (0.01)	$ 0.04
Net income	$ 0.26	$ 0.21	$ 0.70	$ 0.77
Weighted average number of shares outstanding:
Basic	13,585	14,413	13,639	14,563
Diluted	13,813	14,739	13,891	14,823