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Note 17 - Employee Stock Ownership Plan (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2012
Mar. 31, 2018
Mar. 31, 2017
Oct. 10, 2012
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Amount $ 2,962,400      
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 296,240 88,872 74,060 296,240
Employee Stock Ownership Plan ESOP Shares Purchased by ESOP Initial Public Offering Shares Percentage 8.00%      
Share Price $ 10     $ 10
Employee Stock Ownership Plan ESOP Debt Structure Direct Loan Term   20 years    
Employee Stock Ownership Plan ESOP Debt Structure Direct Loan Interest Rate   4.50%    
Employee Stock Ownership Plan ESOP, Vesting Period   5 years    
Employee Stock Ownership Plan (ESOP), Compensation Expense   $ 224,481 $ 235,633  
Employee Stock Ownership Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%    
Employee Stock Ownership Plan [Member] | Completion of Five Years of Credited Services [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00%