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Note 12 - Lease Commitments (Tables)
3 Months Ended
Jul. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Fiscal Years Ended April 30,
 
($ in thousands)
 
         
2019
   
1,366
 
2020
   
1,399
 
2021
   
1,432
 
2022    
1,506
 
2023 and thereafter
   
8,496
 
    $
14,199