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Note 5 - Property and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accumulated depreciation $ (5,482,576) $ (3,939,251)
Total Property and Equipment, net 40,991,160 41,702,155
Structures and Displays [Member]    
Property, plant and equipment, gross 44,545,708 44,025,894
Vehicles and Equipment [Member]    
Property, plant and equipment, gross 1,002,118 642,081
Office Furniture and Equipment [Member]    
Property, plant and equipment, gross $ 925,910 $ 973,431