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Note 5 - Property and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Accumulated depreciation $ (4,777,025) $ (3,939,251)
Total Property and Equipment, net 41,366,909 41,702,155
Structures and Displays [Member]    
Property, plant and equipment, gross 44,362,511 44,025,894
Vehicles and Equipment [Member]    
Property, plant and equipment, gross 710,876 642,081
Office Furniture and Equipment [Member]    
Property, plant and equipment, gross $ 1,070,547 $ 973,431