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Note 4 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
March 31, 2021
   
December 31, 2020
 
Cash on consolidated balance sheet
  $
4,102,887
    $
4,541,013
 
Restricted cash
   
876,401
     
780,998
 
Total cash and restricted cash
  $
4,979,288
    $
5,322,011