Note 13 - Fair Value Measurements - Derivatives Measured On a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Sep. 30, 2017	Mar. 31, 2017
Offsetting Commercial Real Estate Loan by Interest Rate Swap [Member] \| Loans and Leases [Member]
Loans - Commercial real estate loan	$ 3,171,879	$ 3,201,691
Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivative - Interest rate swap	(37,476)	(26,647)
Derivatives - Interest rate swaps designated as cash flow hedge	(186,917)	(83,634)
Fair Value, Inputs, Level 1 [Member] \| Offsetting Commercial Real Estate Loan by Interest Rate Swap [Member] \| Loans and Leases [Member]
Loans - Commercial real estate loan
Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivative - Interest rate swap
Derivatives - Interest rate swaps designated as cash flow hedge
Fair Value, Inputs, Level 2 [Member] \| Offsetting Commercial Real Estate Loan by Interest Rate Swap [Member] \| Loans and Leases [Member]
Loans - Commercial real estate loan	3,171,879	3,201,691
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivative - Interest rate swap	(37,476)	(26,647)
Derivatives - Interest rate swaps designated as cash flow hedge	(186,917)	(83,634)
Fair Value, Inputs, Level 3 [Member] \| Offsetting Commercial Real Estate Loan by Interest Rate Swap [Member] \| Loans and Leases [Member]
Loans - Commercial real estate loan
Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member] \| Other Liabilities [Member]
Derivative - Interest rate swap
Derivatives - Interest rate swaps designated as cash flow hedge

Fair value of all liability derivatives designated as cash flow hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313

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- Definition

Fair value of all derivative liabilities designated as fair value hedging instruments.

+ References

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