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Note 3 - Restricted Cash (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Insurance premium escrow
  $
343,518
    $
1,038,767
 
   
December 31,
 
   
2019
   
2018
 
                 
Cash and cash equivalents
  $
16,028,514
    $
17,105,072
 
Restricted cash
   
343,518
     
1,038,767
 
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statements of Cash Flows
  $
16,372,032
    $
18,143,839