Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Royalties and license fees	$ 30,277	$ 29,774	$ 27,445
Product sales	22,798	22,506	20,742
Research and development	4,364	3,852	3,741
Total revenue	57,439	56,132	51,928
Operating costs and expenses:
Product costs	8,016	7,898	7,418
Research and development	15,550	15,079	14,143
Selling, general and administrative	15,297	13,859	14,025
Restructuring charges		476
Total operating costs and expenses	38,863	37,312	35,586
Operating income from continuing operations	18,576	18,820	16,342
Other (loss) income:
Investment income, net	238	268	540
Impairment losses on strategic investments	(1,184)	(158)	(804)
Gains on sale of strategic investments	709	1,293
Other income, net	133	137	228
Other (loss) income	(104)	1,540	(36)
Income from continuing operations before income taxes	18,472	20,360	16,306
Income tax provision	(6,265)	(5,781)	(6,177)
Income from continuing operations	12,207	14,579	10,129
Discontinued operations:
(Loss) income from discontinued operations, net of income taxes	(176)	588	1,176
Loss on sale of discontinued operations, net of income taxes			(1,074)
(Loss) income from discontinued operations	(176)	588	102
Net income	$ 12,031	$ 15,167	$ 10,231
Basic income (loss) per share:
Continuing operations	$ 0.90	$ 1.01	$ 0.58
Discontinued operations	$ (0.01)	$ 0.04	$ 0.01
Net income	$ 0.88	$ 1.05	$ 0.59
Diluted income (loss) per share:
Continuing operations	$ 0.88	$ 0.99	$ 0.58
Discontinued operations	$ (0.01)	$ 0.04	$ 0.01
Net income	$ 0.87	$ 1.03	$ 0.59
Weighted average number of shares outstanding:
Basic	13,632	14,464	17,318
Diluted	13,876	14,731	17,431