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Note 8. Geographic Operating Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenues $ 3,134,024 $ 3,106,389 $ 6,411,363 $ 6,150,171
North America        
Revenues 2,713,482 2,564,841 5,548,488 5,038,155
Europe        
Revenues $ 420,542 $ 541,548 $ 862,875 $ 1,112,016