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Note 21 - Qualified Affordable Housing Project Investments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Amortization Method Qualified Affordable Housing Project Investments	$ 7,900,000		$ 7,900,000		$ 8,600,000
Qualified Affordable Housing Project Investments, Commitment	2,000,000.0		2,000,000.0		$ 4,200,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 247,000	$ 225,000	$ 740,000	$ 675,000
Minimum [Member]
Affordable Housing Tax Credits Commitment, Year to be Paid			2020
Maximum [Member]
Affordable Housing Tax Credits Commitment, Year to be Paid			2027

X

- Definition

Year in which contingent commitments to qualified affordable housing project investments are expected to be paid, in CCYY format.

+ References

No definition available.

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X

- Definition

Amount of investment in qualified affordable housing projects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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X

- Definition

Amount of amortization expense of investment in qualified affordable housing projects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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- Definition

Amount of commitment or contingent commitments to qualified affordable housing project investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985

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