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Note 19 - Fair Value Measurements - Financial Assets and Liabilities Measured On a Recurring Basis (Details) - USD ($)
Mar. 31, 2018
Mar. 31, 2017
Financial assets    
Loans receivable, net of unearned income $ 390,420,885 $ 338,933,198
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Financial assets    
Cash and cash equivalents 23,368,415 29,353,921
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Cash and cash equivalents 23,368,415 29,353,921
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Financial assets    
Federal Home Loan Bank stock 3,122,400 2,020,200
Bank-owned life insurance 17,455,850 18,253,348
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Federal Home Loan Bank stock 3,122,400 2,020,200
Bank-owned life insurance 17,455,850 18,253,348
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Financial assets    
Certificates of deposit held as investment 499,189 499,280
Loans receivable, net of unearned income 387,328,993 335,758,154
Financial liabilities    
Deposits 405,142,975 412,855,774
Advance payments by borrowers for taxes and insurance 1,962,665 1,868,110
Borrowings, fair value 60,672,140 36,124,899
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets    
Certificates of deposit held as investment 492,751 505,641
Loans receivable, net of unearned income 385,818,260 337,444,534
Financial liabilities    
Deposits 405,026,957 413,148,503
Advance payments by borrowers for taxes and insurance 1,962,665 1,868,110
Borrowings, fair value $ 60,494,922 $ 36,697,631