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Note 12 - Lease Commitments (Tables)
9 Months Ended
Jan. 31, 2019
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Fiscal Years Ended April 30,
 
($ in thousands)
 
         
2020
   
1,399
 
2021
   
1,432
 
2022
   
1,506
 
2023
   
1,596
 
2024 and thereafter
   
6,900
 
    $
12,833