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Note 13 - Fair Value Measurements (Tables)
12 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Fair Value
 
Promissory notes
  $
-
    $
-
    $
-
    $
-
 
Long-term debt
   
-
     
-
     
3,975
     
3,975
 
    $
-
    $
-
    $
3,975
    $
3,975
 
   
Level 1
   
Level 2
   
Level 3
   
Fair Value
 
Promissory notes
  $
-
    $
-
    $
2,387
    $
2,387
 
Long-term debt
   
-
     
-
     
3,347
     
3,347
 
    $
-
    $
-
    $
5,734
    $
5,734