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Note 12 - Fair Value Measurements - Financial Assets and Liabilities Measured On a Recurring Basis (Details) - USD ($)
Sep. 30, 2018
Mar. 31, 2018
Financial assets    
Loans receivable, net of unearned income $ 375,939,704 $ 390,420,885
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Financial assets    
Cash and cash equivalents 22,025,835 23,368,415
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Cash and cash equivalents 22,025,835 23,368,415
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Financial assets    
Federal Home Loan Bank stock 2,782,400 3,122,400
Bank-owned life insurance 17,684,501 17,455,850
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Federal Home Loan Bank stock 2,782,400 3,122,400
Bank-owned life insurance 17,684,501 17,455,850
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Financial assets    
Certificates of deposit held as investment 499,144 499,189
Loans receivable, net of unearned income 372,890,164 387,328,993
Deposits 388,470,615 405,142,975
Advance payments by borrowers for taxes and insurance 1,216,584 1,962,665
Borrowings, fair value 53,551,896 60,672,140
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Certificates of deposit held as investment 484,051 492,751
Loans receivable, net of unearned income 362,598,185 385,818,260
Deposits 389,242,489 405,026,957
Advance payments by borrowers for taxes and insurance 1,216,584 1,962,665
Borrowings, fair value $ 52,396,435 $ 60,494,922