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Note 8 - Fair Value Measurements (Tables)
 3 Months Ended
Jul. 31, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
Total Carrying Value in Consolidated Balance Sheet
 
 
Quoted prices in active markets for identical assts or liabilities
(Level 1)
 
 
Significant other observable inputs
(Level 2)
 
 
Significant unobservable inputs
(Level 3)
 
   
(in thousands)
  
                                 
Warrant liabilities
   $
286
    $
-
    $
-
    $
286
 
 
 
Total Carrying Value in Consolidated Balance Sheet
 
 
Quoted prices in active markets for identical assts or liabilities
(Level 1)
 
 
Significant other observable inputs
(Level 2)
 
 
Significant unobservable inputs
(Level 3)
 
   
(in thousands)
  
                                 
Warrant liabilities
   $
323
    $
-
    $
-
    $
323
 
Changes on Value of Warrant Liability [Table Text Block]
Fair Value Measurement Using Significant Unobservable Inputs ( Level 3)  
       
   
Total
  
   
Warrant
 
   
Liability
  
   
(in thousands)
  
         
Fair value – April 30, 2016
   $
-
 
Issuance
    
1,814
 
Transfers
    
-
 
Change in fair value
    
(1,491
 )
Fair value – April 30, 2017
   $
323
 
         
Change in fair value
    
(37
 )
Fair value – July 31, 2017
   $
286