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Note 19 - Fair Value Measurements - Calculation of Estimated Fair Values Based On Market Conditions At Specific Point of Time (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Loans receivable, net of unearned income $ 338,933,198 $ 221,859,056
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 29,353,921 67,448,536
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 29,353,921 67,448,536
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Loans held for sale 259,450
Federal Home Loan Bank stock 2,020,200 1,042,500
Bank-owned life insurance 18,253,348 12,709,908
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Loans held for sale 266,176
Federal Home Loan Bank stock 2,020,200 1,042,500
Bank-owned life insurance 18,253,348 12,709,908
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Certificates of deposit held as investment 499,280 3,968,229
Loans receivable, net of unearned income 335,678,292 218,604,150
Deposits 412,855,774 313,993,651
Advance payments by borrowers for taxes and insurance 1,868,110 1,079,794
Borrowings 36,124,899 14,805,237
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Certificates of deposit held as investment 505,641 3,911,474
Loans receivable, net of unearned income 337,183,808 220,671,409
Deposits 413,148,503 314,095,055
Advance payments by borrowers for taxes and insurance 1,868,110 1,079,794
Borrowings $ 36,697,631 $ 15,146,307