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Note 8 - Restricted Stock (Tables)
 12 Months Ended
Mar. 31, 2019
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, 2018
    
133
      
60
      
193
  
                         
Restricted stock granted
    
47
      
38
      
85
  
                         
Restricted stock vested
    
(86
 )    
(30
 )    
(116
 )
                         
Restricted stock forfeited or expired
    
(12
 )    
-
      
(12
 )
                         
Non-vested restricted stock outstanding at March 31, 2019
    
82
      
68
      
150