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Note 10 - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
(In thousands)
 
Fiscal 2017
  $ 6,376  
Fiscal 2018
    5,350  
Fiscal 2019
    4,684  
Fiscal 2020
    3,968  
Fiscal 2021
    2,237  
Thereafter
    3,418  
Total minimum lease payments
  $ 26,033