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Note 4 - Restricted Cash (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
   
6/30/2018
   
3/31/2018
 
                 
Cash and cash equivalents
  $
5,746,521
    $
4,803,238
 
Restricted Cash
   
18,832
     
269,659
 
Total cash, cash equivalents and restricted cash shown in the statement of cash flows
  $
5,765,353
    $
5,072,897