Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Financial Assets:
Held-to-maturity, Fair Value	$ 10,604	$ 11,107
Fair Value, Inputs, Level 1
Financial Assets:
Cash and cash equivalents	37,733	31,228
Securities Available-for-Sale	0	0
Held-to-maturity, Fair Value	0	0
Loans Receivable	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits	0	0
Financial Liabilities:
Deposits	278,925	277,360
Advances from FHLB of New York	0	0
Other borrowed money	0	0
Accrued interest payable	0	0
Fair Value, Inputs, Level 2
Financial Assets:
Cash and cash equivalents	0	0
Securities Available-for-Sale	70,443	79,845
Held-to-maturity, Fair Value	10,604	11,107
Loans Receivable	0	0
Accrued interest receivable	2,019	2,019
Mortgage servicing rights	0	0
Other assets - Interest-bearing deposits	980	976
Financial Liabilities:
Deposits	184,944	200,143
Advances from FHLB of New York	11,999	8,001
Other borrowed money	13,371	12,393
Accrued interest payable	2,426	1,931
Fair Value, Inputs, Level 3
Financial Assets:
Cash and cash equivalents	0	0
Securities Available-for-Sale	0	0
Held-to-maturity, Fair Value	0	0
Loans Receivable	422,890	424,013
Accrued interest receivable	0	0
Mortgage servicing rights	172	180
Other assets - Interest-bearing deposits	0	0
Financial Liabilities:
Deposits	0	0
Advances from FHLB of New York	0	0
Other borrowed money	0	0
Accrued interest payable	0	0
Reported Value Measurement
Financial Assets:
Cash and cash equivalents	37,733	31,228
Securities Available-for-Sale	70,443	79,845
Held-to-maturity, Fair Value	10,447	11,137
Loans Receivable	417,712	424,182
Accrued interest receivable	2,019	2,019
Mortgage servicing rights	172	180
Other assets - Interest-bearing deposits	980	976
Financial Liabilities:
Deposits	464,298	480,196
Advances from FHLB of New York	12,000	8,000
Other borrowed money	13,403	13,403
Accrued interest payable	2,426	1,931
Estimate of Fair Value Measurement
Financial Assets:
Cash and cash equivalents	37,733	31,228
Securities Available-for-Sale	70,443	79,845
Held-to-maturity, Fair Value	10,604	11,107
Loans Receivable	422,890	424,013
Accrued interest receivable	2,019	2,019
Mortgage servicing rights	172	180
Other assets - Interest-bearing deposits	980	976
Financial Liabilities:
Deposits	463,869	477,503
Advances from FHLB of New York	11,999	8,001
Other borrowed money	13,371	12,393
Accrued interest payable	$ 2,426	$ 1,931