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Note 18 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Fourth
Quarter
    
Year
  
   
(in thousands, except per share data)
  
20
20
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
8,071
     $
7,690
     $
7,504
     $
8,634
     $
31,899
  
Gross profit
    
3,676
      
3,063
      
2,877
      
3,084
      
12,700
  
Net income (loss)
    
(133
)
    
228
      
171
      
121
      
387
  
Net income (loss) per share
                                        
Basic and diluted
    
(0.02
)
    
0.04
      
0.03
      
0.01
      
0.06
  
                                         
201
9
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
7,145
     $
6,954
     $
10,044
     $
6,059
     $
30,202
  
Gross profit
    
1,836
      
2,285
      
4,116
      
2,229
      
10,466
  
Net income (loss)
    
(1,275
)
    
(1,136
)
    
288
      
(1,473
)
    
(3,596
)
Net income (loss) per share
                                        
Basic and diluted
    
(0.22
)
    
(0.20
)
    
0.05
      
(0.25
)
    
(0.62
)