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Note 5 - Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
                 
Structures, displays and towers
  $
44,009,351
    $
41,320,458
 
Vehicles and equipment
   
1,841,536
     
1,245,210
 
Office furniture and equipment
   
1,260,214
     
990,810
 
Accumulated depreciation
   
(7,558,918
)    
(6,731,459
)
                 
Total Property and Equipment, net
  $
39,552,183
    $
36,825,019