Note 19 - Fair Value Measurements (Details Textual) - USD ($)		Mar. 31, 2018	Mar. 31, 2017
Impaired Financing Receivable, Recorded Investment, Total	[1]	$ 8,720,339	$ 5,657,048
Real Estate Acquired Through Foreclosure		457,778	503,094
Fraternity Community Bancorp, Inc. [Member]
Assets Held-for-sale, Not Part of Disposal Group, Current, Total			547,884
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired Financing Receivable, Recorded Investment, Total		8,720,339	5,657,048
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		266,256	285,359
Real Estate Acquired Through Foreclosure		$ 457,778	$ 503,094

[1] Generally accepted accounting principles require that we record acquired loans at fair value at acquisition, which includes a discount for loans with credit impairment. These purchased credit impaired loans are not performing according to their contractual terms and meet the definition of an impaired loan. Although we do not accrue interest income at the contractual rate on these loans, we do recognize an accretable yield as interest income to the extent such yield is supported by cash flow analysis of the underlying loans.