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Note 12 - Earnings (Loss) Per Share (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Net Income
(loss)
(Numerator)
    
Shares
(Denominator)
    
Per Share
Amount
  
   
(in thousands, except per share amounts)
  
Year ended March 31, 2020:
                        
Basic income per share
   $
387
      
5,956
     $
0.06
  
Effective dilutive securities—Common stock options
    
—
      
5
      
—
  
Diluted income per share
   $
387
      
5,961
     $
0.06
  
Year ended March 31, 2019:
                        
Basic and diluted loss per share
   $
(3,596
)
    
5,819
     $
(0.62
)
Year ended March 31, 2018:
                        
Basic income per share
   $
1,025
      
5,709
     $
0.18
  
Effective dilutive securities—Common stock options
    
—
      
72
      
—
  
Diluted income per share
   $
1,025
      
5,781
     $
0.18