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Note 6 - Property and Equipment (Tables)
12 Months Ended
Apr. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
As of April 30,
 
($ in thousands)
 
2019
   
2018
 
                 
Building and leasehold improvements
  $
1,013
    $
1,013
 
Furniture and equipment
   
4,042
     
4,031
 
     
5,055
     
5,044
 
Accumulated depreciation and amortization
   
(3,909
)    
(3,673
)
Total property and equipment, net
  $
1,146
    $
1,371