CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 16,635,070	$ 15,427,275	$ 33,887,078	$ 29,399,882
Cost of sales	8,239,481	7,822,941	17,018,241	14,684,409
Gross profit	8,395,589	7,604,334	16,868,837	14,715,473
Operating expenses:
Marketing and selling	4,162,179	4,394,090	8,711,223	9,040,876
Research and development	312,023	247,889	651,181	624,158
General and administrative	2,148,164	2,128,024	4,355,706	4,236,837
Total operating expenses	6,622,366	6,770,003	13,718,110	13,901,871
Income from operations	1,773,223	834,331	3,150,727	813,602
Other income (expense):
Interest income	11,050	9,465	20,322	19,200
Interest expense		(8,395)	(2,358)	(89,545)
Other income (expense)	(61,131)	48,712	(57,782)	29,057
Income before income taxes	1,723,142	884,113	3,110,909	772,314
Income tax expense	523,892	281,599	899,514	245,147
Net income	$ 1,199,250	$ 602,514	$ 2,211,395	$ 527,167
Net income per share - basic (in dollars per share)	$ 0.10	$ 0.05	$ 0.18	$ 0.04
Net income per share - diluted (in dollars per share)	$ 0.10	$ 0.05	$ 0.18	$ 0.04
Weighted average number of common shares outstanding - basic (in shares)	12,146,969	12,003,167	12,092,003	12,049,900
Weighted average number of common shares outstanding - diluted (in shares)	12,604,099	12,235,701	12,482,558	12,258,402