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Note 8 - Related Party Transactions (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
   
2018
    
2017
  
                 
Balance - Beginning of year
  
$
345,314
    $
381,948
  
New loans and lines of credit advances
  
 
1,600
     
7,500
  
Principal repayments
  
 
(216,960
)
    
(44,134
 )
Balance - End of year
  
$
129,954
    $
345,314