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Note 4 - Allowance for Loan Losses (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring	$ 4,500		$ 4,500		$ 360
Financing Receivable, Modifications, Number of Contracts		0
Financing Receivable, Deferred Payments	$ 182,600		$ 182,600
Financing Receivable, Percentage of Deferred Payments Loans to Total Loan Balances	28.00%		28.00%
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	1		1
Commercial Real Estate Portfolio Segment [Member] | TDR Loans [Member]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total	$ 23		$ 23
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable, Modifications, Number of Contracts				1
Performing Financial Instruments [Member]
Financing Receivable, Troubled Debt Restructuring	$ 4,300		$ 4,300		$ 0

X

- Definition

Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

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X

- Definition

Percentage of loans receivable with deferred payments to total loans receivable balances.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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-Publisher FASB
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-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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