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Note 11 - Earnings (Loss) Per Share (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Net
Income
(l
oss
)

(Numerator)
    
Shares
(Denominator)
    
Per Share
Amount
  
   
(in thousands, except per share amounts)
  
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
  
Year ended March 31, 2017:
                        
Basic and diluted loss per share
   $
(1,215
)
    
5,658
     $
(0.21
)
Year ended March 31, 2016:
                        
Basic and diluted loss per share
   $
(4,395
)
    
5,581
     $
(0.79
)