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Note 9 - Lease Commitments (Tables)
12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Fiscal Years Ended April 30,
 
($ in thousands)
 
         
2018
   
824
 
2019
   
1,366
 
2020
   
1,399
 
2021
   
1,432
 
2022 and thereafter
   
10,002
 
    $
15,023