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Note 13 - Fair Value Measurements (Tables)
12 Months Ended
Apr. 30, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Fair Value
 
Long-term debt
  $
-
    $
-
    $
5,439
    $
5,439
 
    $
-
    $
-
    $
5,439
    $
5,439
 
   
Level 1
   
Level 2
   
Level 3
   
Fair Value
 
Long-term debt
  $
-
    $
-
    $
3,975
    $
3,975
 
    $
-
    $
-
    $
3,975
    $
3,975