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Note 11 - Summary of Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Mar. 31, 2020
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Quarter Ended
  
   
June 30,
2019
    
September 30,
2019
    
December 31,
2019
    
March 31,
2020
  
Net sales
   $
40,975,320
     $
39,995,580
     $
28,150,817
     $
32,980,607
  
Gross profit (loss)
    
1,471,324
      
(782,650
 )    
52,933
      
1,868,728
  
Net earnings (loss)
    
194,772
      
(1,544,137
 )    
(881,003
 )    
(3,018,842
 )
Basic
    
.03
      
(.22
 )    
(.13
 )    
(.43
 )
Diluted
    
.03
      
(.22
 )    
(.13
 )    
(.43
 )
   
Quarter Ended
  
   
June 30,
2018
    
September 30,
2018
    
December 31,
2018
    
March 31,
2019
  
Net sales
   $
48,193,318
     $
53,432,029
     $
43,326,080
     $
42,203,066
  
Gross profit
    
6,192,478
      
3,944,541
      
1,930,484
      
839,534
  
Net earnings (loss)
    
3,599,893
      
2,000,916
      
664,773
      
(1,165,658
 )
Basic (1)
    
.51
      
.29
      
.09
      
(.17
 )
Diluted (1)
    
.51
      
.29
      
.09
      
(.17
 )