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Segment Information and Concentrations (Tables)
 3 Months Ended
Sep. 30, 2013
Notes to Financial Statements  
Revenue by geographic areas
  

Three Months Ended

September 30,

 

Nine Months Ended

September 30,

   2013  2012  2013  2012
Revenues:                    
   United States  $2,492,640   $1,971,957   $8,296,712   $6,450,535 
   Europe   656,571    494,343    2,140,903    2,884,395 
   Asia and rest of world   142,428    330,054    1,554,630    1,452,685 
      Total revenues  $3,291,639  $2,796,354  $11,992,245  $10,787,615
Major customers accounted for at least 10% of total revenues
  

Three Months Ended

September 30,

 

Nine Months Ended

September 30,

   2013  2012  2013  2012
Ingram Micro Inc.   22%   19%   19%   18%
ScanSource, Inc.   26%   24%   22%   21%
BlueStar, Inc.   18%   16%   14%   * 
Major customers as a percentage of net accounts receivable balances
   September 30,  December 31,
   2013  2012
Company A   34%   28%
Company B   26%   12%
Company C   10%   16%
Company D   *    11%
Company E   *    12%