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Note 3 - Restricted Cash (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
June 30,
   
December 31,
 
   
2019
   
2018
 
                 
Insurance premium escrow
  $
706,317
    $
1,038,767
 
   
June 30,
   
June 30,
 
   
2019
   
2018
 
                 
Cash and cash equivalents
  $
11,656,150
    $
88,166,783
 
Restricted cash
   
706,317
     
506,046
 
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows
  $
12,362,467
    $
88,672,829