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Note 10 - Other Comprehensive Loss (Tables)
 12 Months Ended
Mar. 31, 2021
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Twelve Months Ended March 31, 2021
  
   
Before-Tax
    
Tax Benefit
    
Net-of-Tax
  
                         
Cash flow hedges (1)
   $
(14,751,900
 )   $
3,564,059
     $
(11,187,841
 )
Other comprehensive loss
   $
(14,751,900
 )   $
3,564,059
     $
(11,187,841
 )