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Note 3 - Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
September 30,
    
December 31,
  
   
2019
    
2018
  
                 
Insurance premium escrow
   $
405,335
     $
1,038,767
  
   
September 30,
    
September 30,
  
   
2019
    
2018
  
                 
Cash and cash equivalents
   $
9,622,876
     $
4,817,750
  
Restricted cash
    
405,335
      
771,549
  
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows
   $
10,028,211
     $
5,589,299