Note 7 - Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Legacy Loans [Member] \| Real Estate Loans [Member] \| One-to four-family [Member]
Unpaid contractual principal balance	$ 2,116,820	$ 2,221,429
Recorded investment with no allowance	626,719	652,411
Recorded investment with allowance	1,291,808	1,440,169
Total recorded investment	1,918,527	2,092,580
Related allowance	59,571	97,632
Average recorded investment	1,865,000	2,176,952
Interest recognized	63,498	72,593
Legacy Loans [Member] \| Real Estate Loans [Member] \| Commercial [Member]
Unpaid contractual principal balance	3,433,621	3,433,669
Recorded investment with no allowance	2,717,144	3,358,447
Total recorded investment	2,717,144	3,358,447
Average recorded investment	3,298,855	3,359,762
Interest recognized	99,599	157,242
Legacy Loans [Member] \| Real Estate Loans [Member] \| Commercial construction [Member]
Unpaid contractual principal balance		2,549,027
Recorded investment with no allowance		1,374,530
Total recorded investment		1,374,530
Average recorded investment		1,775,778
Legacy Loans [Member] \| Commercial Portfolio Segment [Member]
Unpaid contractual principal balance	1,884,258	2,730,393
Recorded investment with no allowance	1,279,233	1,961,074
Recorded investment with allowance		49,350
Total recorded investment	1,279,233	2,010,424
Related allowance		730
Average recorded investment	1,557,871	2,810,816
Interest recognized	147,101	96,056
Legacy Loans [Member] \| Home equity loans [Member]
Unpaid contractual principal balance	82,740	67,924
Recorded investment with no allowance	59,169	15,229
Total recorded investment	59,169	15,229
Average recorded investment	18,817	40,701
Interest recognized	331	112
Legacy Loans [Member]
Unpaid contractual principal balance	7,517,439	11,002,442
Recorded investment with no allowance	4,682,265	7,361,691
Recorded investment with allowance	1,291,808	1,489,519
Total recorded investment	5,974,073	8,851,210
Related allowance	59,571	98,362
Average recorded investment	6,740,543	10,164,009
Interest recognized	310,529	$ 326,003
Acquired Loans [Member] \| Real Estate Loans [Member] \| One-to four-family [Member]
Unpaid contractual principal balance	2,444,002
Recorded investment with no allowance	1,210,306
Total recorded investment	1,210,306
Average recorded investment	1,387,353
Interest recognized	86,587
Acquired Loans [Member] \| Real Estate Loans [Member] \| Commercial [Member]
Unpaid contractual principal balance	261,239
Recorded investment with no allowance	211,239
Total recorded investment	211,239
Average recorded investment	212,806
Interest recognized	9,978
Acquired Loans [Member] \| Consumer Portfolio Segment [Member]
Unpaid contractual principal balance	72,358
Recorded investment with no allowance	42,488
Total recorded investment	42,488
Average recorded investment	43,233
Interest recognized	7,086
Acquired Loans [Member]
Unpaid contractual principal balance	2,777,599
Recorded investment with no allowance	1,464,033
Total recorded investment	1,464,033
Average recorded investment	1,643,392
Interest recognized	$ 103,651

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

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Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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Namespace Prefix:	us-gaap_
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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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