Consolidated Statements of Income - USD ($) shares in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Royalties and license fees	$ 31,763,000	$ 30,277,000	$ 29,774,000
Product sales	24,925,000	22,798,000	22,506,000
Research and development	5,210,000	4,364,000	3,852,000
Total revenue	61,898,000	57,439,000	56,132,000
Operating costs and expenses:
Product costs	8,619,000	8,016,000	7,898,000
Research and development	16,165,000	15,550,000	15,079,000
Selling, general and administrative	15,525,000	15,297,000	13,859,000
Restructuring charges	0	0	476,000
Claim settlement	2,500,000
Total operating costs and expenses	42,809,000	38,863,000	37,312,000
Operating income from continuing operations	19,089,000	18,576,000	18,820,000
Other income (loss):
Investment income, net	156,000	238,000	268,000
Impairment losses on strategic investments	(1,500,000)	(1,184,000)	(158,000)
Gains on sale of strategic investments		709,000	1,293,000
Other income, net	496,000	133,000	137,000
Other (loss) income	(848,000)	(104,000)	1,540,000
Income from continuing operations before income taxes	18,241,000	18,472,000	20,360,000
Income tax provision	(6,294,000)	(6,265,000)	(5,781,000)
Income from continuing operations	11,947,000	12,207,000	14,579,000
Discontinued operations:
(Loss) income from discontinued operations, net of income taxes		(176,000)	588,000
(Loss) Income from discontinued operations		(176,000)	588,000
Net income	$ 11,947,000	$ 12,031,000	$ 15,167,000
Basic income (loss) per share:
Continuing operations	$ 0.92	$ 0.90	$ 1.01
Discontinued operations	0.00	(0.01)	0.04
Net income	0.92	0.88	1.05
Diluted income (loss) per share:
Continuing operations	0.90	0.88	0.99
Discontinued operations	0.00	(0.01)	0.04
Net income	$ 0.90	$ 0.87	$ 1.03
Weighted average number of shares outstanding:
Basic	13,029	13,632	14,464
Diluted	13,289	13,876	14,731