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Note 13 - Fair Value Measurements - Calculation of Estimated Fair Values Based On Market Conditions At Specific Point of Time (Details) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Loans receivable, net of unearned income $ 353,668,253 $ 338,933,198
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 20,226,289 29,353,921
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 20,226,289 29,353,921
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal Home Loan Bank stock 2,020,200 2,020,200
Bank-owned life insurance 18,375,924 18,253,348
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal Home Loan Bank stock 2,020,200 2,020,200
Bank-owned life insurance 18,375,924 18,253,348
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Certificates of deposit held as investment 499,257 499,280
Loans receivable, net of unearned income 350,513,425 335,678,292
Deposits 412,302,243 412,855,774
Advance payments by borrowers for taxes and insurance 2,842,724 1,868,110
Borrowings 35,975,228 36,124,899
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Certificates of deposit held as investment 507,112 505,641
Loans receivable, net of unearned income 351,744,563 337,183,808
Deposits 412,584,763 413,148,503
Advance payments by borrowers for taxes and insurance 2,842,724 1,868,110
Borrowings $ 36,438,242 $ 36,697,631