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Note 4 - Plant, Property and Equipment, Net (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Abstract]        
Depreciation $ 9,038 $ 9,098 $ 27,548 $ 28,488