CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Sales	$ 101,348	$ 77,751
Cost of sales	54,257	37,206
Gross profit	47,091	40,545
Operating expenses:
Selling, general and administrative	6,702	5,363
Research and development	4,375	3,365
Bad debt expense	347	269
Total operating expenses	11,424	8,997
Income from operations	35,667	31,548
Other income (expense):
Interest expense	(132)	(85)
Interest income	31	229
Foreign exchange gains (losses)	(21)	46
Other, net	(26)	(16)
Total other income (expense), net	(148)	174
Income before income taxes	35,519	31,722
Income tax expense	11,343	9,709
Net income	$ 24,176	$ 22,013
Basic earnings per share	$ 1.86	$ 1.72
Diluted earnings per share	$ 1.85	$ 1.70
Weighted average shares outstanding - Basic	12,947,195	12,827,918
Weighted average shares outstanding - Diluted	13,000,113	12,926,814