Note 3 - Acquisitions - Allocation of Preliminary Purchase Price (Details) - USD ($)		Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	May 13, 2016	Mar. 31, 2016
Goodwill		$ 8,563,530	$ 8,563,530	$ 9,822,026		$ 6,767,811
Fraternity Community Bancorp, Inc. [Member]
Cash and cash equivalents					$ 15,196,058
Investment securities available for sale					17,570,712
FHLB Bank Stock					782,600
Loans	[1]				108,804,183
Allowance For Loan Loss
Premises and equipment					769,806
Bank-Owned Life Insurance					5,058,041
Deferred income taxes					2,333,104
Other assets					2,877,665
Total identifiable assets					153,392,169
Non-interest bearing deposits					1,242,187
Interest bearing deposits					108,746,923
Borrowings					15,793,537
Other liabilities					4,023,914
Total identifiable liabilities					129,806,561
Net tangible assets acquired					23,585,608
Definite lived intangible assets acquired					242,020
Goodwill					1,877,243
Net intangible assets acquired					2,119,263
Total cash consideration					25,704,871
Fraternity Community Bancorp, Inc. [Member] | Carrying Amount by Acquiree [Member]
Cash and cash equivalents					15,196,058
Investment securities available for sale					17,570,712
FHLB Bank Stock					782,600
Loans	[1]				108,872,041
Allowance For Loan Loss					(1,550,000)
Premises and equipment					691,095
Bank-Owned Life Insurance					5,058,041
Deferred income taxes					2,743,481
Other assets					2,877,665
Total identifiable assets					152,241,693
Non-interest bearing deposits					1,242,187
Interest bearing deposits					107,648,792
Borrowings					15,000,000
Other liabilities					4,023,914
Total identifiable liabilities					127,914,893
Net tangible assets acquired					24,326,800
Definite lived intangible assets acquired
Goodwill
Net intangible assets acquired
Total cash consideration					24,326,800
Fraternity Community Bancorp, Inc. [Member] | Fair Value Adjustments [Member]
Cash and cash equivalents
Investment securities available for sale
FHLB Bank Stock
Loans	[1]				(67,858)
Allowance For Loan Loss	[1]				1,550,000
Premises and equipment	[2]				78,711
Bank-Owned Life Insurance
Deferred income taxes	[3]				(410,377)
Other assets
Total identifiable assets					1,150,476
Non-interest bearing deposits
Interest bearing deposits	[4]				1,098,131
Borrowings	[5]				793,537
Other liabilities
Total identifiable liabilities					1,891,668
Net tangible assets acquired					(741,192)
Definite lived intangible assets acquired					242,020
Goodwill					1,877,243
Net intangible assets acquired					2,119,263
Total cash consideration					$ 1,378,071

[1] Adjustment reflects the fair value adjustments based on Hamilton Bancorp’s evaluation of the acquired loan portfolio and excludes the allowance for losses recorded by Fraternity Community Bancorp, Inc.

[2] Adjustment reflects the fair value adjustments based on Hamilton Bancorp’s evaluation of the acquired premises and equipment.

[3] Adjustment to record deferred tax asset related to fair value adjustments at 39.45% income tax rate.

[4] Adjustment arises since the rates on interest-bearing deposits are higher than rates available on similar deposits as of the acquisition date.

[5] Adjustment reflects the fair value of Fraternity’s borrowings acquired on acquisition date.