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Note 5 - Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
   
December 31,
 
   
2019
   
2018
 
                 
Structures, displays, and equipment
  $
44,545,708
    $
44,025,894
 
Vehicles and equipment
   
1,002,118
     
642,081
 
Office furniture and equipment
   
925,910
     
973,431
 
Accumulated depreciation
   
(5,482,576
)    
(3,939,251
)
                 
Total Property and Equipment, net
  $
40,991,160
    $
41,702,155