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Note 12 - Lease Commitments (Tables)
3 Months Ended
Jul. 31, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Fiscal Years Ended April 30,
 
($ in thousands)
 
         
2018
    199  
2019
    204  
2020
    211  
2021
    217  
2022 and thereafter
    691  
    $ 1,522