Organization and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Net Sales by Geographic Area

For the three and six months ended June 30, 2013 and 2012, net sales by geographic area were as follows:

	Three Months Ended June 30,								Six Months Ended June 30,
	2013				2012				2013				2012
United States	$	27,240,212	85	%	$	23,393,683	83	%	$	54,554,200	87	%	$	45,005,597	84	%
Other Countries		4,935,585	15			4,828,760	17			8,055,249	13			8,858,238	16
Total	$	32,175,797	100	%	$	28,222,443	100	%	$	62,609,449	100	%	$	53,863,835	100	%

Weighted Average Number of Shares Outstanding and Income Per Share

The calculation of the weighted average number of shares outstanding and income per share are as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Numerator for basic and diluted earnings per share:
Net income	$	4,457,534	$	3,442,247	$	7,755,355	$	7,246,065
Denominator:
Weighted average shares outstanding – basic		51,109,060		54,520,889		51,923,097		58,849,010
Dilutive effect of stock-based awards		1,744,106		645,755		1,775,690		633,664
Diluted weighted average shares outstanding		52,853,166		55,166,644		53,698,787		59,482,674
Anti-dilutive stock-based awards excluded		1,235,117		5,346,367		1,234,221		6,534,472
Net income per common share:
Basic	$	0.09	$	0.06	$	0.15	$	0.12
Diluted	$	0.08	$	0.06	$	0.14	$	0.12

Summary of Changes in Estimated Product Warranty Liabilities

Changes in the Company’s estimated product warranty liabilities are as follows:

	Six Months Ended June 30,
	2013			2012
Balance, January 1,	$	483,721		$	427,459
Utilization of accrual		(295,179	)		(164,578	)
Warranty expense		505,852			97,226
Balance, June 30,	$	694,394		$	360,107