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Note 6 - Property and Equipment (Tables)
12 Months Ended
Apr. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
As of April 30,
 
($ in thousands)
 
2018
   
2017
 
                 
Building and leasehold improvements
  $
1,013
    $
789
 
Furniture and equipment
   
4,031
     
3,865
 
     
5,044
     
4,654
 
Accumulated depreciation and amortization
   
(3,673
)    
(3,415
)
Total property and equipment, net
  $
1,371
    $
1,239