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Note 3 - Restricted Cash (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Restrictions on Cash and Cash Equivalents [Table Text Block]
   
March 31,
   
December 31,
 
   
2019
   
2018
 
                 
Insurance premium escrow
  $
692,275
    $
1,038,767
 
   
March 31,
   
March 31,
 
   
2019
   
2018
 
                 
Cash and cash equivalents
  $
10,157,438
    $
60,171,072
 
Restricted cash
   
692,275
     
508,751
 
                 
Total Cash, Cash Equivalents, and Restricted Cash as Presented in the Consolidated Statement of Cash Flows
  $
10,849,713
    $
60,679,823