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Note 8. Geographical Information (Tables)
6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Revenue based on geographic region
   Three months ended  Six months ended
   June 30,  June 30,
Geographic Region  2016  2015  2016  2015
North America  $2,713,482   $2,564,841   $5,548,488   $5,038,155 
Europe   420,542    541,548    862,875    1,112,016 
Total  $3,134,024   $3,106,389    6,411,363   $6,150,171