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Note 3 - Acquisition of SynGen (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Business Acquisition, Pro Forma Information [Table Text Block]
   
Three Months Ended
March 31, 2017
  
Net revenues
   $
3,380,000
  
Net loss
   $
(2,248,000
 )
Basic and diluted net loss per common share
   $
(0.22
 )