Note 7 - Loans Receivable and Allowance for Loan Losses - Balances of Classified Loans Based On Risk Grade (Details) - USD ($)		Mar. 31, 2017	Mar. 31, 2016
Loans Receivable		$ 338,999,832	$ 222,767,212
Legacy Loans [Member]
Loans Receivable	[1]	209,897,546	172,922,696
Acquired Loans [Member]
Loans Receivable		129,102,286	49,844,516
Pass [Member]
Loans Receivable		324,151,352	205,488,120
Pass [Member] | Legacy Loans [Member]
Loans Receivable		200,026,200	157,642,785
Pass [Member] | Acquired Loans [Member]
Loans Receivable		124,125,152	47,845,335
Special Mention [Member]
Loans Receivable		11,401,812	11,968,761
Special Mention [Member] | Legacy Loans [Member]
Loans Receivable		7,828,565	11,433,613
Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		3,573,247	535,148
Substandard [Member]
Loans Receivable		3,446,668	5,310,331
Substandard [Member] | Legacy Loans [Member]
Loans Receivable		2,042,781	3,846,298
Substandard [Member] | Acquired Loans [Member]
Loans Receivable		1,403,887	1,464,033
Doubtful [Member]
Loans Receivable
Doubtful [Member] | Legacy Loans [Member]
Loans Receivable
Doubtful [Member] | Acquired Loans [Member]
Loans Receivable
Unlikely to be Collected Financing Receivable [Member]
Loans Receivable
Unlikely to be Collected Financing Receivable [Member] | Legacy Loans [Member]
Loans Receivable
Unlikely to be Collected Financing Receivable [Member] | Acquired Loans [Member]
Loans Receivable
Real Estate Loans [Member]
Loans Receivable		293,721,660	183,801,748
Real Estate Loans [Member] | Legacy Loans [Member]
Loans Receivable	[1]	174,842,452	139,853,364
Real Estate Loans [Member] | Acquired Loans [Member]
Loans Receivable		118,879,208	43,948,384
Real Estate Loans [Member] | Residential [Member] | Legacy Loans [Member]
Loans Receivable		73,552,753	50,567,898
Real Estate Loans [Member] | Residential [Member] | Acquired Loans [Member]
Loans Receivable		83,892,389	24,002,009
Real Estate Loans [Member] | Residential [Member] | Pass [Member]
Loans Receivable		152,949,798	72,071,292
Real Estate Loans [Member] | Residential [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		71,721,341	48,271,948
Real Estate Loans [Member] | Residential [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		81,228,457	23,799,344
Real Estate Loans [Member] | Residential [Member] | Special Mention [Member]
Loans Receivable		3,224,423	1,920,315
Real Estate Loans [Member] | Residential [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable		1,499,436	1,920,315
Real Estate Loans [Member] | Residential [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		1,724,987
Real Estate Loans [Member] | Residential [Member] | Substandard [Member]
Loans Receivable		1,270,921	681,980
Real Estate Loans [Member] | Residential [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable		331,976	375,635
Real Estate Loans [Member] | Residential [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable		938,945	306,345
Real Estate Loans [Member] | Investor Loans [Member] | Legacy Loans [Member]
Loans Receivable		6,742,469	12,076,911
Real Estate Loans [Member] | Investor Loans [Member] | Acquired Loans [Member]
Loans Receivable		18,779,644	15,783,008
Real Estate Loans [Member] | Investor Loans [Member] | Pass [Member]
Loans Receivable		24,880,026	25,937,376
Real Estate Loans [Member] | Investor Loans [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		6,728,493	11,697,157
Real Estate Loans [Member] | Investor Loans [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		18,151,533	14,240,219
Real Estate Loans [Member] | Investor Loans [Member] | Special Mention [Member]
Loans Receivable		408,803	886,983
Real Estate Loans [Member] | Investor Loans [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable			351,835
Real Estate Loans [Member] | Investor Loans [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		408,803	535,148
Real Estate Loans [Member] | Investor Loans [Member] | Substandard [Member]
Loans Receivable		233,284	931,880
Real Estate Loans [Member] | Investor Loans [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable		13,976	27,919
Real Estate Loans [Member] | Investor Loans [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable		219,308	903,961
Real Estate Loans [Member] | Commercial [Member]
Loans Receivable		107,564,212	78,115,203
Real Estate Loans [Member] | Commercial [Member] | Legacy Loans [Member]
Loans Receivable	[1]	92,665,689	75,225,984
Real Estate Loans [Member] | Commercial [Member] | Acquired Loans [Member]
Loans Receivable		14,898,523	2,889,219
Real Estate Loans [Member] | Commercial [Member] | Pass [Member]
Loans Receivable		98,177,735	69,502,936
Real Estate Loans [Member] | Commercial [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		84,789,748	66,824,956
Real Estate Loans [Member] | Commercial [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		13,387,987	2,677,980
Real Estate Loans [Member] | Commercial [Member] | Special Mention [Member]
Loans Receivable		7,634,821	5,683,884
Real Estate Loans [Member] | Commercial [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable		6,329,129	5,683,884
Real Estate Loans [Member] | Commercial [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		1,305,692
Real Estate Loans [Member] | Commercial [Member] | Substandard [Member]
Loans Receivable		1,751,656	2,928,383
Real Estate Loans [Member] | Commercial [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable		1,546,812	2,717,144
Real Estate Loans [Member] | Commercial [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable		204,844	211,239
Real Estate Loans [Member] | Commercial construction [Member]
Loans Receivable		3,190,193	3,256,719
Real Estate Loans [Member] | Commercial construction [Member] | Legacy Loans [Member]
Loans Receivable	[1]	1,881,541	1,982,571
Real Estate Loans [Member] | Commercial construction [Member] | Acquired Loans [Member]
Loans Receivable		1,308,652	1,274,148
Real Estate Loans [Member] | Commercial construction [Member] | Pass [Member]
Loans Receivable		3,190,193	3,256,719
Real Estate Loans [Member] | Commercial construction [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		1,881,541	1,982,571
Real Estate Loans [Member] | Commercial construction [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		1,308,652	1,274,148
Real Estate Loans [Member] | Commercial construction [Member] | Special Mention [Member]
Loans Receivable
Real Estate Loans [Member] | Commercial construction [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable
Real Estate Loans [Member] | Commercial construction [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable
Real Estate Loans [Member] | Commercial construction [Member] | Substandard [Member]
Loans Receivable
Real Estate Loans [Member] | Commercial construction [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable
Real Estate Loans [Member] | Commercial construction [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable
Commercial Portfolio Segment [Member]
Loans Receivable		21,537,366	20,395,592
Commercial Portfolio Segment [Member] | Legacy Loans [Member]
Loans Receivable	[1]	19,518,029	17,773,967
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Loans Receivable		2,019,337	2,621,625
Commercial Portfolio Segment [Member] | Pass [Member]
Loans Receivable		21,396,100	16,251,582
Commercial Portfolio Segment [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		19,376,763	13,629,957
Commercial Portfolio Segment [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		2,019,337	2,621,625
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans Receivable			3,477,579
Commercial Portfolio Segment [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable			3,477,579
Commercial Portfolio Segment [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans Receivable		141,266	666,431
Commercial Portfolio Segment [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable		141,266	666,431
Commercial Portfolio Segment [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable
Home equity loans [Member]
Loans Receivable		20,544,370	14,390,761
Home equity loans [Member] | Legacy Loans [Member]
Loans Receivable	[1]	13,278,229	12,222,688
Home equity loans [Member] | Acquired Loans [Member]
Loans Receivable		7,266,141	2,168,073
Home equity loans [Member] | Pass [Member]
Loans Receivable		20,402,642	14,331,592
Home equity loans [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		13,269,478	12,163,519
Home equity loans [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		7,133,164	2,168,073
Home equity loans [Member] | Special Mention [Member]
Loans Receivable		132,977
Home equity loans [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable
Home equity loans [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		132,977
Home equity loans [Member] | Substandard [Member]
Loans Receivable		8,751	59,169
Home equity loans [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable		8,751	59,169
Home equity loans [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable
Consumer Portfolio Segment [Member]
Loans Receivable		3,196,436	4,179,111
Consumer Portfolio Segment [Member] | Legacy Loans [Member]
Loans Receivable	[1]	2,258,836	3,072,677
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Loans Receivable		937,600	1,106,434
Consumer Portfolio Segment [Member] | Pass [Member]
Loans Receivable		3,154,858	4,136,623
Consumer Portfolio Segment [Member] | Pass [Member] | Legacy Loans [Member]
Loans Receivable		2,258,836	3,072,677
Consumer Portfolio Segment [Member] | Pass [Member] | Acquired Loans [Member]
Loans Receivable		896,022	1,063,946
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans Receivable		788
Consumer Portfolio Segment [Member] | Special Mention [Member] | Legacy Loans [Member]
Loans Receivable
Consumer Portfolio Segment [Member] | Special Mention [Member] | Acquired Loans [Member]
Loans Receivable		788
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans Receivable		40,790	42,488
Consumer Portfolio Segment [Member] | Substandard [Member] | Legacy Loans [Member]
Loans Receivable
Consumer Portfolio Segment [Member] | Substandard [Member] | Acquired Loans [Member]
Loans Receivable		$ 40,790	$ 42,488

[1] As a result of the acquisition of Fraternity Community Bancorp, Inc., the parent company of Fraternity Federal Savings and Loan, in May 2016 and Fairmount Bancorp, Inc., the parent company of Fairmount Bank, in September 2015, we have segmented the portfolio into two components, loans originated by Hamilton Bank "Legacy" and loans acquired from Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. "Acquired".