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Note 3 - Restricted Cash (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
June 30,
    
December 31,
  
   
2018
    
2017
  
                 
Insurance premium escrow
   $
330,971
     $
247,230
  
Billboard replacement reserve
    
175,075
      
144,995
  
                 
Total Restricted Cash
   $
506,046
     $
392,225
  
   
June 30,
  
   
2018
    
2017
  
                 
Cash and cash equivalents
   $
88,166,783
     $
101,717,930
  
Restricted cash
    
506,046
      
404,822
  
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows
   $
88,672,829
     $
102,122,752