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Note 3 - Restricted Cash (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
March 31,
    
December 31,
  
   
2020
    
2019
  
                 
Insurance premium escrow
   $
483,150
     $
343,518
  
   
March 31,
    
December 31,
  
   
2020
    
2019
  
                 
Cash and cash equivalents
   $
51,606,579
     $
16,028,514
  
Restricted cash
    
483,150
      
343,518
  
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows
   $
52,089,729
     $
16,372,032