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Note 9 - Property and Equipment (Tables)
 3 Months Ended
Jul. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
July 31,
    
April 30,
  
($ in thousands)
  
2017
    
2017
  
Building and leasehold improvements
   $
1,013
    $
789
 
Furniture and equipment
   
3,872
     
3,865
 
     
4,885
     
4,654
 
Accumulated depreciation and amortization
    
(3,478
 )    
(3,415
 )
Total property and equipment, net
   $
1,407
    $
1,239