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Note 8 - Restricted Stock (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Nonvested Share Activity [Table Text Block]
   
Employee Plan
Number of Shares
(In thousands)
    
Director Plan
Number of Shares
(In thousands)
    
Both Plans
Number of Shares
(In thousands)
  
                         
Non-vested restricted stock outstanding at March 31, 2017
    
172
      
60
      
232
  
                         
Restricted stock granted
    
49
      
30
      
79
  
                         
Restricted stock vested
    
(84
 )    
(30
 )    
(114
 )
                         
Restricted stock forfeited or expired
    
(4
 )    
-
      
(4
 )
                         
Non-vested restricted stock outstanding at March 31, 2018
    
133
      
60
      
193