Note 7 - Loans Receivable and Allowance for Loan Losses - Past Due Loans, Segregated By Age and Class of Loans (Details) - USD ($)		Mar. 31, 2017	Mar. 31, 2016
Current		$ 336,098,044	$ 217,131,848
Past due		599,853	1,293,252
Nonaccrual loans		2,301,935	4,342,112
Total Loans		338,999,832	222,767,212
Nonaccrual interest not accrued		182,113	185,706
Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		504,192	532,440
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due		74,631	52,875
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		21,030	707,937
Real Estate Loans [Member]
Total Loans		293,721,660	183,801,748
Real Estate Loans [Member] | Residential [Member]
Nonaccrual loans		675,017	775,178
Nonaccrual interest not accrued		41,637	43,238
Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		69,618	468,887
Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due		74,631	52,875
Real Estate Loans [Member] | Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Investor Loans [Member]
Nonaccrual loans		71,107	675,033
Nonaccrual interest not accrued		30,275	93,637
Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		320,971	42,800
Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		21,030	707,937
Real Estate Loans [Member] | Commercial [Member]
Nonaccrual loans		1,546,812	2,717,144
Total Loans		107,564,212	78,115,203
Nonaccrual interest not accrued		109,818	47,646
Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Commercial construction [Member]
Nonaccrual loans
Total Loans		3,190,193	3,256,719
Nonaccrual interest not accrued
Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		113,603
Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Commercial Portfolio Segment [Member]
Nonaccrual loans			121,760
Total Loans		21,537,366	20,395,592
Nonaccrual interest not accrued
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Home equity loans [Member]
Nonaccrual loans		3,397	49,462
Total Loans		20,544,370	14,390,761
Nonaccrual interest not accrued		66	1,007
Home equity loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Home equity loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Home equity loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Consumer Portfolio Segment [Member]
Nonaccrual loans		5,602	3,535
Total Loans		3,196,436	4,179,111
Nonaccrual interest not accrued		317	178
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due			20,753
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member]
Current		207,328,184	168,814,175
Past due		578,823	708,216
Nonaccrual loans		1,990,539	3,400,305
Total Loans	[1]	209,897,546	172,922,696
Nonaccrual interest not accrued		123,326	67,147
Legacy Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		504,192	489,640
Legacy Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due		74,631	52,875
Legacy Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due			165,701
Legacy Loans [Member] | Real Estate Loans [Member]
Total Loans	[1]	174,842,452	139,853,364
Legacy Loans [Member] | Real Estate Loans [Member] | Residential [Member]
Nonaccrual loans		426,354	474,877
Total Loans		73,552,753	50,567,898
Nonaccrual interest not accrued		6,460	10,666
Legacy Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		69,618	468,887
Legacy Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due		74,631	52,875
Legacy Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member]
Nonaccrual loans		13,976	37,062
Total Loans		6,742,469	12,076,911
Nonaccrual interest not accrued		6,982	7,828
Legacy Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		320,971
Legacy Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due			165,701
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial [Member]
Nonaccrual loans		1,546,812	2,717,144
Total Loans	[1]	92,665,689	75,225,984
Nonaccrual interest not accrued		109,818	47,646
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member]
Nonaccrual loans
Total Loans	[1]	1,881,541	1,982,571
Nonaccrual interest not accrued
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due		113,603
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member] | Commercial Portfolio Segment [Member]
Nonaccrual loans			121,760
Total Loans	[1]	19,518,029	17,773,967
Nonaccrual interest not accrued
Legacy Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Legacy Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member] | Home equity loans [Member]
Nonaccrual loans		3,397	49,462
Total Loans	[1]	13,278,229	12,222,688
Nonaccrual interest not accrued		66	1,007
Legacy Loans [Member] | Home equity loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Legacy Loans [Member] | Home equity loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Home equity loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Legacy Loans [Member] | Consumer Portfolio Segment [Member]
Nonaccrual loans
Total Loans	[1]	2,258,836	3,072,677
Nonaccrual interest not accrued
Legacy Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due			20,753
Legacy Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Legacy Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member]
Current		128,769,860	48,317,673
Past due		21,030	585,036
Nonaccrual loans		311,396	941,807
Total Loans		129,102,286	49,844,516
Nonaccrual interest not accrued		58,787	118,559
Acquired Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due			42,800
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		21,030	542,236
Acquired Loans [Member] | Real Estate Loans [Member]
Total Loans		118,879,208	43,948,384
Acquired Loans [Member] | Real Estate Loans [Member] | Residential [Member]
Nonaccrual loans		248,663	300,301
Total Loans		83,892,389	24,002,009
Nonaccrual interest not accrued		35,177	32,572
Acquired Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member]
Nonaccrual loans		57,131	637,971
Total Loans		18,779,644	15,783,008
Nonaccrual interest not accrued		23,293	85,809
Acquired Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due			42,800
Acquired Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Investor Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due		21,030	542,236
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial [Member]
Nonaccrual loans
Total Loans		14,898,523	2,889,219
Nonaccrual interest not accrued
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member]
Nonaccrual loans
Total Loans		1,308,652	1,274,148
Nonaccrual interest not accrued
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member] | Commercial Portfolio Segment [Member]
Nonaccrual loans
Total Loans		2,019,337	2,621,625
Nonaccrual interest not accrued
Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member] | Home equity loans [Member]
Nonaccrual loans
Total Loans		7,266,141	2,168,073
Nonaccrual interest not accrued
Acquired Loans [Member] | Home equity loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Home equity loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Home equity loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due
Acquired Loans [Member] | Consumer Portfolio Segment [Member]
Nonaccrual loans		5,602	3,535
Total Loans		937,600	1,106,434
Nonaccrual interest not accrued		317	178
Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Past due
Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Past due
Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due

[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".