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Note 5 - Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
   
December 31,
 
   
2018
   
2017
 
                 
Structures and displays
  $
12,167,292
    $
10,484,725
 
Vehicles and equipment
   
232,967
     
143,154
 
Office furniture and equipment
   
418,238
     
395,981
 
Accumulated depreciation
   
(2,537,724
)    
(1,912,847
)
                 
Total Property and Equipment, net
  $
10,280,773
    $
9,111,013