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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment, Useful Life [Table Text Block]
   
Years
  
         
Structures
    
15
  
Digital displays and electrical
    
3
to
10
  
Static and tri-vision displays
    
7
to
15
  
Vehicles, equipment, and furniture
    
2
to
5
  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
Years
  
         
Customer relationships
    
3
to
10
  
Permits, licenses, and lease acquisition costs
    
10
to
50
  
Noncompetition and nonsolicitation agreements
    
2
to
5
  
Technology, trade names, and trademarks
    
2
to
3
  
Site location
    
15