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Note 21 - Fair Value Measurements and Fair Values of Financial Instruments - Valuation Techniques and the Unobservable Inputs Used in Determining Fair Value - Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded investment - with allowance	$ 3,375	$ 4,851
Related allowance	1,051	1,605
Fair Value, Nonrecurring [Member]
Recorded investment - with allowance	2,324	3,246
Related allowance	1,051	1,605
Fair value		3,246
Fair value		3,246
Foreclosed assets held for sale	2,886	1,703
Fair value		1,703
Residential Portfolio Segment [Member]
Foreclosed assets held for sale	292	64
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Recorded investment - with allowance	0	2,515
Related allowance	0	781
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Recorded investment - with allowance	904	1,340
Related allowance	149	659
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Recorded investment - with allowance	478	487
Related allowance	48	49
Valuation, Market Approach [Member] | Land Receivable [Member] | Fair Value, Nonrecurring [Member]
Fair value	70	110
Valuation, Market Approach [Member] | Commercial Real Estate Receivables [Member] | Fair Value, Nonrecurring [Member]
Fair value	2,524	1,529
Valuation, Market Approach [Member] | Residential Portfolio Segment [Member] | Fair Value, Nonrecurring [Member]
Fair value	292	64
Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Fair Value, Nonrecurring [Member]
Fair value		1,734
Fair value		1,734
Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Fair Value, Nonrecurring [Member]
Fair value	17	0
Fair value	17	0
Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Fair Value, Nonrecurring [Member]
Fair value	430	438
Fair value	430	438
Impaired Loans [Member]
Recorded investment - with allowance	3,375	4,851
Related allowance	1,051	1,605
Fair value	$ 2,324
Discount rate
Fair value	$ 2,324
Impaired Loans [Member] | Valuation, Market Approach [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Recorded investment - with allowance	732	509
Related allowance	176	116
Fair value	556	393
Fair value	$ 556	$ 393
Impaired Loans [Member] | Valuation, Market Approach [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Weighted Average [Member]
Discount rate	30.00%	26.00%
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Recorded investment - with allowance	$ 1,261	$ 2,515
Related allowance	678	$ 781
Fair value	$ 583
Discount rate	47.00%
Fair value	$ 583
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Weighted Average [Member]
Discount rate		16.00%
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Recorded investment - with allowance	106	$ 75
Related allowance	89	75
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Measurement Input, Discount to Borrower's Financial Statement Value [Member]
Recorded investment - with allowance	798	1,265
Related allowance	60	584
Fair value	$ 738	$ 681
Discount rate	15.00%	36.00%
Fair value	$ 738	$ 681
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Weighted Average [Member]
Discount rate	69.00%	100.00%
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Recorded investment - with allowance	$ 478	$ 487
Related allowance	$ 48	$ 49
Impaired Loans [Member] | Valuation, Market Approach [Member] | Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] | Weighted Average [Member]
Discount rate	46.00%	56.00%
Foreclosed Assets Held For Sale [Member]
Foreclosed assets held for sale	$ 2,886	$ 1,703
Valuation allowance	0	0
Fair value	2,886
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Land Receivable [Member]
Foreclosed assets held for sale	70	110
Valuation allowance	$ 0	$ 0
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Land Receivable [Member] | Weighted Average [Member]
Discount rate	53.00%	61.00%
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Commercial Real Estate Receivables [Member]
Foreclosed assets held for sale	$ 2,524	$ 1,529
Valuation allowance	$ 0	$ 0
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Commercial Real Estate Receivables [Member] | Weighted Average [Member]
Discount rate	39.00%	20.00%
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Residential Portfolio Segment [Member]
Foreclosed assets held for sale	$ 292	$ 64
Valuation allowance	$ 0	$ 0
Foreclosed Assets Held For Sale [Member] | Valuation, Market Approach [Member] | Residential Portfolio Segment [Member] | Weighted Average [Member]
Discount rate	46.00%	68.00%

X

- Definition

The fair value of foreclosed real estate.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5162-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
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For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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