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Note 7. Geographical Information (Tables)
3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Revenue based on geographic region
    Three months ended  
    March 31,  
    2017     2016  
Geographic region            
North America   $ 2,539,210     $ 2,835,006  
Europe     316,921       442,333  
Total revenues   $ 2,856,131     $ 3,277,339