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Note 4 - Cash - Restricted (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
   
March 31, 2018
 
Cash
  $
1,585.950
 
Cash-restricted
   
993,160
 
Cash and cash-restricted
  $
2.579,110