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Note 2 - Equity Compensation Plans and Capital Stock (Tables)
 12 Months Ended
Mar. 31, 2021
Notes Tables  
Nonvested Restricted Stock Shares Activity [Table Text Block]
     
 
 
  
Weighted
  
     
 
 
  
Average Grant
  
   
Number of
    
Date Fair Value
  
   
Shares
    
Per Share
  
Unvested at March 31, 2019
    
180,000
     $
7.03
  
Cancelled or forfeited
    
—
      
—
  
Granted
    
90,000
      
5.05
  
Vested
    
—
      
—
  
Unvested at March 31, 2020
    
270,000
     $
6.37
  
Cancelled or forfeited
    
—
      
—
  
Granted
    
89,625
      
5.64
  
Vested
    
(20,000
 )    
8.23
  
Unvested at March 31, 2021
    
339,625
     $
6.07