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Note M - Commitments and Contingencies (Tables)
 12 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Lease
    
Sublease
    
Net lease
  
   
commitments
    
income
    
commitments
  
                         
2020
   $
1,404
     $
267
     $
1,137
  
2021
    
1,319
      
245
      
1,074
  
2022
    
1,572
      
247
      
1,325
  
2023
    
1,596
      
175
      
1,421
  
2024
    
1,545
      
169
      
1,376
  
Thereafter
    
6,120
      
521
      
5,599
  
                         
    $
13,556
     $
1,624
     $
11,932