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Note 8. Geographical Information (Tables)
3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Revenue based on geographic region
    Three months ended  
      March 31,  
    2016     2015  
Geographic region            
North America   $ 2,835,006      $ 2,473,314  
Europe     442,333        570,468  
Total revenues   $ 3,277,339      $ 3,043,782