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Note 4 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
Cash on consolidated balance sheet
  $
606,672
    $
486,604
 
Restricted cash
   
654,897
     
629,651
 
Total cash and restricted cash   $
1,261,569
    $
1,116,255