Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
Royalties and license fees	$ 7,908	$ 7,385	$ 22,566	$ 22,179
Product sales	6,583	6,067	18,082	16,632
Research and development	1,423	1,164	3,887	3,292
Total revenue	15,914	14,616	44,535	42,103
Operating costs and expenses:
Product costs	2,174	2,037	6,031	5,737
Research and development	3,860	3,655	11,839	11,488
Selling, general and administrative	4,023	3,591	11,841	11,736
Total operating costs and expenses	10,057	9,283	29,711	28,961
Operating income	5,857	5,333	14,824	13,142
Other income:
Investment income, net	36	42	149	194
Gain on sales of strategic investments		28		709
Other (loss) income, net	(40)		496	125
Other (loss) income, net	(4)	70	645	1,028
Income from continuing operations before income taxes	5,853	5,403	15,469	14,170
Income tax provision	(1,929)	(1,729)	(4,879)	(4,407)
Income from continuing operations	3,924	3,674	10,590	9,763
Loss from discontinued operations, net of income taxes		(76)		(76)
Net income	$ 3,924	$ 3,598	$ 10,590	$ 9,687
Basic net income (loss) per share:
Continuing operations	$ 0.30	$ 0.27	$ 0.81	$ 0.72
Discontinued operations	0.00	(0.01)	0.00	(0.01)
Net income	0.30	0.26	0.81	0.71
Diluted net income per share
Continuing operations	0.30	0.27	0.79	0.70
Discontinued operations	0.00	(0.01)	0.00	(0.01)
Net income	$ 0.30	$ 0.26	$ 0.79	$ 0.70
Weighted average number of shares outstanding:
Basic	13,002	13,585	13,057	13,639
Diluted	13,279	13,813	13,324	13,891