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Note 9 - Summary of Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
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
 )