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Note 2 - Supplementary Cash Flow Information (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
   
Fiscal Years Ended April 30,
 
($ in thousands)
 
2016
   
2015
   
2014
 
State and local income tax payments
  $ 188     $ 238     $ 114  
Federal income tax payments to the Parent
  $ 3,545     $ 3,366     $ 2,254