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Note 11 - Summary of Amortizable Intangible Assets by Geographic Region (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
UNITED STATES    
Amortizable intangible assets $ 685,395 $ 702,594
GERMANY    
Amortizable intangible assets 479,080 530,410
Amortizable intangible assets $ 1,164,475 $ 1,233,004