CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Sales	$ 76,420	$ 56,233	$ 154,171	$ 99,514
Cost of sales	40,864	31,173	78,051	53,796
Gross profit	35,556	25,060	76,120	45,718
Operating expenses:
Selling, general and administrative	5,899	4,911	11,262	9,646
Research and development	3,768	3,509	7,133	6,398
Bad debt expense	338	168	607	604
Total operating expenses	10,005	8,588	19,002	16,648
Gain (loss) on disposal of equipment	5		(14)
Income from operations	25,556	16,472	57,104	29,070
Other income (expense):
Interest expense	(48)	(43)	(130)	(43)
Interest income	230	176	459	443
Foreign exchange gains (losses)	(714)	171	(668)	293
Other, net		47	(19)	(8)
Total other income (expense), net	(532)	351	(358)	685
Income before income taxes	25,024	16,823	56,746	29,755
Income tax expense	8,155	5,392	17,864	9,639
Net income	$ 16,869	$ 11,431	$ 38,882	$ 20,116
Basic earnings per share	$ 1.31	$ 0.90	$ 3.02	$ 1.58
Diluted earnings per share	$ 1.30	$ 0.89	$ 3.01	$ 1.57
Weighted average shares outstanding-Basic	12,882,396	12,726,292	12,854,858	12,715,356
Weighted average shares outstanding-Diluted	12,955,566	12,860,780	12,924,014	12,839,560