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Note 8 - Earnings Per Share (Tables)
 12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended March 31,
  
   
2021
    
2020
  
Basic
      
 
      
 
Net earnings (loss)
   $
11,424,475
     $
(5,249,210
 )
Weighted average common shares
    
7,027,707
      
7,000,403
  
Dilutive
      
 
      
 
Net earnings (loss)
   $
11,424,475
     $
(5,249,210
 )
Weighted average common shares and common share equivalents
    
7,027,707
      
7,000,403