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Note 9 - Property and Equipment (Tables)
 6 Months Ended
Oct. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
October 31,
    
April 30,
  
($ in thousands)
  
2017
    
2017
  
Building and leasehold improvements
   $
1,013
     $
789
  
Furniture and equipment
    
4,032
      
3,865
  
     
5,045
      
4,654
  
Accumulated depreciation and amortization
    
(3,542
 )    
(3,415
 )
Total property and equipment, net
   $
1,503
     $
1,239