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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 ($)
Dec. 31, 2016
Mar. 31, 2016
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents $ 18,315,750 $ 67,448,536
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 18,315,750 67,448,536
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Loans held for sale 259,450
Federal Home Loan Bank stock 1,640,100 1,042,500
Bank-owned life insurance 18,132,876 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 1,640,100 1,042,500
Bank-owned life insurance 18,132,876 12,709,908
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Certificates of deposit held as investment 499,303 3,968,229
Loans receivable, net 328,202,517 218,604,150
Deposits 408,324,942 313,993,651
Advance payments by borrowers for taxes and insurance 1,112,278 1,079,794
Borrowings 26,194,142 14,805,237
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Certificates of deposit held as investment 501,394 3,911,474
Loans receivable, net 330,775,927 220,671,409
Deposits 408,859,890 314,095,055
Advance payments by borrowers for taxes and insurance 1,112,278 1,079,794
Borrowings $ 26,822,718 $ 15,146,307