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Note 5 - Loans and Allowance for Loan Losses - Impairment Loans and Leases, Disaggregated by Loan Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Average balance with related allowance	$ 18,643	$ 9,754	$ 21,248	$ 9,771
Interest income with related allowance	33	176	103	222
Other Financing Receivables [Member]
Interest income with no related allowance	0	0	0
Construction And Land Development Loans [Member]
Average balance with no related allowance	762	269	765	271
Interest income with no related allowance	0	18	0	24
Commercial and Industrial Sector [Member]
Average balance with no related allowance	1,782	0	1,819	0
Interest income with no related allowance	7	0	24	0
Average balance with related allowance	433	0	482	0
Interest income with related allowance	0	0	0	0
Commercial Real Estate [Member]
Average balance with no related allowance	2,679	2,552	2,689	2,560
Interest income with no related allowance	25	152	77	169
Average balance with related allowance	0	894	0	895
Interest income with related allowance	0	0	0	0
Residential Mortgage [Member]
Average balance with no related allowance	2,916	906	2,755	907
Interest income with no related allowance	0	3	0	25
Small Business Administration Loans [Member] | Commercial Portfolio Segment [Member]
Average balance with no related allowance	10,017	3,005	12,682	3,007
Interest income with no related allowance	0	3	0	4
Average balance with related allowance	39	2,128	41	2,131
Interest income with related allowance	1		2
Other Financing Receivables [Member]
Average balance with no related allowance	$ 15	$ 0	$ 15	$ 0

X

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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+ References

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-Topic 310
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-Paragraph 15
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+ References

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