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Note 5 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
December 31,
 
   
2019
   
2018
 
                 
Structures, displays, and equipment
  $
44,362,511
    $
44,025,894
 
Vehicles and equipment
   
710,876
     
642,081
 
Office furniture and equipment
   
1,070,547
     
973,431
 
Accumulated depreciation
   
(4,777,025
)    
(3,939,251
)
                 
Total Property and Equipment, net
  $
41,366,909
    $
41,702,155