Note 3 - Acquisitions - Merger Related Expenses Included In Consolidated Statements of Operations (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Merger related expenses	$ 219,417	$ 899,606
Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses	219,417	899,606
Legal [Member] | Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses	55,500	502,326
Professional Services [Member] | Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses	157,567	316,959
Data Processing [Member] | Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses		48,745
Advertising [Member] | Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses		4,885
Other [Member] | Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. [Member]
Merger related expenses	$ 6,350	$ 26,691