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Note 9 - Property and Equipment (Tables)
9 Months Ended
Jan. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
January 31,
   
April 30,
 
($ in thousands)
 
2019
   
2018
 
                 
Building and leasehold improvements
  $
1,013
    $
1,013
 
Furniture and equipment
   
4,037
     
4,031
 
     
5,050
     
5,044
 
Accumulated depreciation and amortization
   
(3,853
)    
(3,673
)
Total property and equipment, net
  $
1,197
    $
1,371