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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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
  
2
to
3
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