CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Sales	$ 78,148	$ 55,201	$ 232,319	$ 154,715
Cost of sales	44,273	32,241	122,338	86,037
Gross profit	33,875	22,960	109,981	68,678
Operating expenses:
Selling, general and administrative	5,610	4,838	16,872	14,484
Research and development	3,327	2,800	10,460	9,198
Bad debt expense (recovery)	(53)	(279)	554	325
Total operating expenses	8,884	7,359	27,886	24,007
Income from operations	24,991	15,601	82,095	44,671
Other income (expense):
Interest expense	(62)	(76)	(192)	(119)
Interest income	236	118	695	561
Foreign exchange gains (losses)	(235)	(9)	(903)	284
Other, net	11	(47)	(8)	(55)
Total other income (expense), net	(50)	(14)	(408)	671
Income before income taxes	24,941	15,587	81,687	45,342
Income tax expense	7,950	4,851	25,814	14,491
Net income	$ 16,991	$ 10,736	$ 55,873	$ 30,851
Basic earnings per share	$ 1.32	$ 0.84	$ 4.34	$ 2.42
Diluted earnings per share	$ 1.31	$ 0.83	$ 4.32	$ 2.40
Weighted average shares outstanding—Basic	12,911,316	12,748,166	12,873,677	12,726,252
Weighted average shares outstanding—Diluted	12,982,322	12,882,448	12,943,105	12,852,370