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Segment Information and Concentrations (Tables)
 3 Months Ended
Mar. 31, 2013
Notes to Financial Statements  
Revenue by geographic areas
   Three Months Ended March 31,
Revenues:  2013  2012
   United States   $2,577,630   $2,223,059 
   Europe    873,147    1,229,495 
   Asia and rest of world    814,398    501,205 
      Total Revenues   $4,265,175  $3,953,759
           
Major customers accounted for at least 10% of total revenues
   Three Months Ended March 31,
   2013  2012
Scansource, Inc.    20%   22%
Ingram Micro Inc.    16%   16%
CF Company.    18%   * 
Major customers as a percentage of net accounts receivable balances
   March 31,  December 31,
   2013  2012
Company A    23%   28%
Company B    18%   12%
Company C    16%   16%
Company D    14%   11%
Company E    *    12%