Note 6 - Loans Receivable and Allowance for Loan Losses - Number of Contracts and Outstanding Loan Balance at Time of Modification (Details) - Real Estate Loans [Member] - One-to four-family [Member]	3 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Outstanding recorded investment	$ 1,931	$ 712,786
Number of contracts	1	11