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Note 8 - Summary of Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
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
 )
   
Quarter Ended
  
   
June 30,
2015
    
September 30,
2015
    
December 31,
2015
    
March 31,
2016
  
Net sales
   $
23,968,569
     $
23,165,705
     $
18,548,247
     $
15,948,861
  
Gross profit
    
2,141,893
      
907,703
      
1,467,289
      
176,759
  
Net earnings (loss)
    
525,949
      
(193,294
 )    
485,120
      
(523,775
 )
Basic
    
.08
      
(.03
 )    
.07
      
(.08
 )
Diluted
    
.08
      
(.03
 )    
.07
      
(.08
 )