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Note 12 - Segment Reporting - Summary of Property and Equipment by Geographic Region (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Property and equipment $ 28,688,762 $ 24,620,298 [1]
CANADA    
Property and equipment 1,555,813 1,176,371
UNITED STATES    
Property and equipment 27,107,392 23,417,435
GERMANY    
Property and equipment $ 25,557 $ 26,492
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.