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Note 4 - Loans Receivables and Allowance for Loan Losses (Details Textual)	1 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Maximum Period of Credit Extension of Construction Loans		1 year 180 days
Period for Charged Off of Open-End Credits		180 days
Period for Charged Off of Close-End Credits		120 days
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		$ 79,000	$ 39,000	$ 23,000
Threshold Period Past Due for Write-off of Financing Receivable		90 days
Maximum Period for Charged Off of Consumer Installment Loans		180 days
Performance Period Under Loan Terms		6 years
Loans and Leases Receivable, Impaired, Commitment to Lend		$ 0	0
Impaired Financing Receivable, Recorded Investment		8,951,000	12,851,000
Impaired Financing Receivable, Related Allowance		$ 231,000	$ 3,000
Number of Borrowers		9	11
Financing Receivable, Modifications, Number of Contracts		0	0
Non-Accrual Loans [Member]
Impaired Financing Receivable, Interest Income, Cash Basis Method		$ 0	$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member]
Maximum Percentage of Credit Extension Based on Market Value of Collateral		75.00%
Impaired Financing Receivable, Recorded Investment		$ 6,267,000	7,745,000
Impaired Financing Receivable, Related Allowance
Multi-family Real Estate [Member]
Maximum Percentage of Credit Extension Based on Market Value of Collateral		80.00%
Construction Portfolio Segment [Member]
Percentage of Maximum Loan to Value		75.00%
Impaired Financing Receivable, Recorded Investment
Impaired Financing Receivable, Related Allowance
Commercial Portfolio Segment [Member]
Gain (Loss) on Loan Default		(3,000,000)
Impaired Financing Receivable, Recorded Investment		231,000
Impaired Financing Receivable, Related Allowance		$ 231,000
Commercial Portfolio Segment [Member] | Subsequent Event [Member]
Proceeds from Insurance Settlement, Investing Activities	$ 2,800,000

X

- Definition

The gain (loss) resulting from a default of loans.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Maximum percentage of credit extension based on market value of collateral.

+ References

No definition available.

+ Details

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X

- Definition

Maximum period for charged off of consumer installment loans.

+ References

No definition available.

+ Details

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X

- Definition

Maximum period of credit extension of construction loans.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of borrowers in loan transactions.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of maximum loan to value.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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X

- Definition

Represents performance period under loan terms.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Period for charged off of close end credits.

+ References

No definition available.

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X

- Definition

Period for charged off of open end credits

+ References

No definition available.

+ Details

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X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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X

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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X

- 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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X

- 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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X

- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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X

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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X

- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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- Definition

Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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