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Note 9 - Summary of Quarterly Results of Operations (Unaudited)
 12 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
9
.   SUMMARY OF QUARTERLY RESULTS OF OPERATIONS (Unaudited)
 
The following is a summary of unaudited quarterly results of operations for the years ended
March 
31,
2018
and
2017:
 
   
Quarter Ended
  
   
June 30,
2017
    
September 30,
2017
    
December 31,
2017
    
March 31,
2018
  
Net sales
   $
23,083,269
     $
26,077,710
     $
28,033,521
     $
43,962,778
  
Gross profit
    
1,263,423
      
1,377,170
      
1,669,134
      
3,942,170
  
Net earnings
    
170,620
      
310,039
      
122,929
      
2,155,816
  
Basic
    
.02
      
.04
      
.02
      
.31
  
Diluted
    
.02
      
.04
      
.02
      
.31
  
 
   
Quarter Ended
  
   
June 30,
2016
    
September 30,
2016
    
December 31,
2016
    
March 31,
2017
  
Net sales
   $
22,393,764
     $
18,317,506
     $
15,988,745
     $
21,056,040
  
Gross profit (loss)
    
(1,252,988
 )    
(45,711
 )    
571,571
      
535,506
  
Net earnings (loss)
    
(1,461,219
 )    
(603,882
 )    
(236,625
 )    
(376,958
 )
Basic
    
(.21
 )    
(.09
 )    
(.03
 )    
(.06
 )
Diluted
    
(.21
 )    
(.09
 )    
(.03
 )    
(.06
 )