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Note 3 - Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
September 30,
    
December 31,
  
   
2018
    
2017
  
                 
Insurance premium escrow
   $
586,428
     $
247,230
  
Billboard replacement reserve
    
185,121
      
144,995
  
                 
Total Restricted Cash
   $
771,549
     $
392,225
  
   
September 30,
 
   
2018
    
2017
  
                 
Cash and cash equivalents
   $
4,817,750
     $
102,810,133
  
Restricted cash
    
771,549
      
649,680
  
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows
   $
5,589,299
     $
103,459,813