Note 6 - Loans Receivable and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) - Legacy Loans [Member]	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Real Estate Loans [Member] | One-to four-family [Member] | Performing Financial Instruments [Member]
Troubled debt restructurings	$ 1,276,856	$ 1,457,552
Real Estate Loans [Member] | One-to four-family [Member] | Nonperforming Financial Instruments [Member]
Troubled debt restructurings	$ 270,167	$ 101,449
Real Estate Loans [Member] | One-to four-family [Member]
Number of contracts	12	12
Troubled debt restructurings	$ 1,547,023	$ 1,559,001
Real Estate Loans [Member] | Commercial [Member] | Nonperforming Financial Instruments [Member]
Troubled debt restructurings	$ 2,658,131	$ 2,717,144
Real Estate Loans [Member] | Commercial [Member]
Number of contracts	2	2
Troubled debt restructurings	$ 2,658,131	$ 2,717,144
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Troubled debt restructurings	$ 612,718	$ 647,654
Commercial Portfolio Segment [Member]
Number of contracts	1	2
Troubled debt restructurings	$ 612,718	$ 647,654
Performing Financial Instruments [Member]
Troubled debt restructurings	1,889,574	2,105,206
Nonperforming Financial Instruments [Member]
Troubled debt restructurings	$ 2,928,298	$ 2,818,593
Number of contracts	15	16
Troubled debt restructurings	$ 4,817,872	$ 4,923,799