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Note 15 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
First
Quarter(1)
    
Second
Quarter(1)
    
Third
Quarter(1)
    
Fourth
Quarter (1)
    
Year
  
   
(in thousands, except per share data)
  
201
8
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
8,809
     $
8,055
     $
9,150
     $
8,101
     $
34,115
  
Gross profit
    
3,603
      
3,620
      
4,240
      
1,908
      
13,371
  
Net income (loss)
    
501
      
475
      
1,107
      
(1,058
)
    
1,025
  
Net income (loss) per share
                                        
Basic and diluted
    
0.09
      
0.08
      
0.19
      
(0.18
)
    
0.18
  
                                         
201
7
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
7,322
     $
9,862
     $
7,605
     $
7,253
     $
32,042
  
Gross profit
    
2,821
      
3,885
      
2,857
      
2,661
      
12,224
  
Net income (loss)
    
(691
)
    
99
      
(349
)
    
(274
)
    
(1,215
)
Net income (loss) per share
                                        
Basic and diluted
    
(0.12
)
    
0.02
      
(0.06
)
    
(0.05
)
    
(0.21
)