Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 15,258,611	$ 12,852,601	$ 29,104,277	$ 23,799,006
Cost of sales	7,828,875	6,493,407	14,706,068	12,035,681
Gross profit	7,429,736	6,359,194	14,398,209	11,763,325
Operating expenses:
Marketing and selling	4,219,492	5,012,747	8,723,612	8,894,727
Research and development	247,889	251,672	624,158	529,527
General and administrative	2,128,024	2,403,698	4,236,837	4,112,791
Total operating expenses	6,595,405	7,668,117	13,584,607	13,537,045
Income (loss) from operations	834,331	(1,308,923)	813,602	(1,773,720)
Other income (expense):
Interest income	9,465	51,977	19,200	104,547
Interest expense	(8,395)	(123,596)	(89,545)	(154,855)
Other income (expense)	48,712	(12,865)	29,057	(29,147)
Income (loss) before income taxes	884,113	(1,393,407)	772,314	(1,853,175)
Income tax expense (benefit)	281,599	(134,009)	245,147	(424,695)
Net income (loss)	$ 602,514	$ (1,259,398)	$ 527,167	$ (1,428,480)
Net income (loss) per share - basic	$ 0.05	$ (0.10)	$ 0.04	$ (0.12)
Net income (loss) per share - diluted	$ 0.05	$ (0.10)	$ 0.04	$ (0.12)
Weighted average number of common shares outstanding-basic	12,003,167	12,223,347	12,049,900	12,174,780
Weighted average number of common shares outstanding-diluted	12,235,701	12,223,347	12,258,402	12,174,780