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Organization and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2013
Organization and Summary of Significant Accounting Policies [Abstract]  
Net sales by geographic area
                 
    Three Months Ended March 31,  
    2013     2012  

United States

    90     84

Other Countries

    10       16  
   

 

 

   

 

 

 

Total

    100     100
   

 

 

   

 

 

 
Weighted average number of shares outstanding and income per share
                 
    Three Months Ended March 31,  
    2013     2012  

Numerator for basic and diluted earnings per share:

               

Net income

  $ 3,297,821     $ 3,803,818  
   

 

 

   

 

 

 

Denominator:

               

Weighted average shares outstanding—basic

    52,746,178       55,700,395  

Dilutive effect of stock-based awards

    1,853,802       657,671  
   

 

 

   

 

 

 

Diluted weighted average shares outstanding

    54,599,980       56,358,066  
   

 

 

   

 

 

 

Anti-dilutive stock-based awards excluded

    1,232,111       6,537,984  
   

 

 

   

 

 

 

Net income per common share:

               

Basic

  $ 0.06     $ 0.07  

Diluted

  $ 0.06     $ 0.07  
Summary of changes in estimated product warranty liabilities
                 
    Three Months Ended March 31,  
    2013     2012  

Balance, January 1,

  $ 483,721     $ 427,459  

Utilization of accrual

    (156,052     (91,860

Warranty expense (recovery)

    168,768       (35,944
   

 

 

   

 

 

 

Balance, March 31,

  $ 496,437     $ 299,655