CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Net sales	$ 54,859	$ 56,583	$ 106,409	$ 106,327
Cost of sales	27,699	28,433	53,187	54,036
Gross profit	27,160	28,150	53,222	52,291
Operating expenses
Selling, general and administrative	19,282	18,664	37,863	36,428
Amortization of intangible assets	652	573	1,236	1,145
Income from operations	7,226	8,913	14,123	14,718
Interest and other expense, net	350	377	668	688
Income before provision for income taxes	6,876	8,536	13,455	14,030
Provision for income taxes	2,552	3,000	4,996	5,000
Net income	4,324	5,536	8,459	9,030
Other comprehensive income (loss)
Foreign currency translation adjustment, net of tax	36	(162)	48	(157)
Comprehensive income	$ 4,360	$ 5,374	$ 8,507	$ 8,873
Net income per common share
Basic (in dollars per share)	$ 0.44	$ 0.57	$ 0.86	$ 0.92
Diluted (in dollars per share)	$ 0.44	$ 0.57	$ 0.86	$ 0.92
Weighted average common shares outstanding
Basic (in shares)	9,843,590	9,741,866	9,840,578	9,766,843
Dilutive effect of stock options (in shares)	9,021	30,671	9,524	28,911
Diluted (in shares)	9,852,611	9,772,537	9,850,102	9,795,754