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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Recorded Investment in TDRs (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018	Dec. 31, 2018 USD ($)
Number of contracts	6	0	5
Recorded investment	$ 10,855,000		$ 2,066,000
Recorded investment	$ (10,855,000)		$ (2,066,000)
Non-Accrual Loans [Member]
Number of contracts	1
Recorded investment	$ 8,800,000
Recorded investment	$ (8,800,000)
Accrual Loans [Member]
Number of contracts	5		5
Recorded investment	$ 2,055,000		$ 2,066,000
Recorded investment	$ (2,055,000)		$ (2,066,000)
Commercial Real Estate Portfolio Segment [Member]
Number of contracts	2		2
Recorded investment	$ 1,073,000		$ 1,081,000
Recorded investment	$ (1,073,000)		$ (1,081,000)
Residential Portfolio Segment [Member]
Number of contracts	1		1
Recorded investment	$ 292,000		$ 296,000
Recorded investment	$ (292,000)		$ (296,000)
Consumer Portfolio Segment [Member]
Number of contracts	2		2
Recorded investment	$ 690,000		$ 689,000
Recorded investment	$ (690,000)		$ (689,000)
Construction Portfolio Segment [Member]
Number of contracts	1
Recorded investment	$ 8,800,000
Recorded investment	$ (8,800,000)

X

- 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=118936363&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=118936363&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

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