Note 5 - Loans - Impaired Loans, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
With no related allowance recorded, Unpaid Principal Balance	$ 4,441	$ 9,415
With no related allowance recorded, Recorded Investment	4,441	9,415
With no related allowance recorded, Average Recorded Investment	4,537	9,604
With no related allowance recorded, Interest Income Recognized	15	29
With a related allowance recorded, Unpaid Principal Balance	498	886
With a related allowance recorded, Recorded Investment	498	886
Related Allowance	102	122
With a related allowance recorded, Average Recorded Investment	497	885
With a related allowance recorded, Interest Income Recognized	19	27
Total by class of loans, Unpaid Principal Balance	4,939	10,301
Total by class of loans, Recorded Investment	4,939	10,301
Total by class of loans, Average Recorded Investment	5,034	10,489
Total by class of loans, Interest Income Recognized	34	56
Related Allowance	102	122
Real Estate, Construction [Member]
With no related allowance recorded, Unpaid Principal Balance	136	292
With no related allowance recorded, Recorded Investment	136	292
With no related allowance recorded, Average Recorded Investment	136	312
With no related allowance recorded, Interest Income Recognized
With a related allowance recorded, Unpaid Principal Balance	213	223
With a related allowance recorded, Recorded Investment	213	223
Related Allowance	20	20
With a related allowance recorded, Average Recorded Investment	214	230
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance	349	515
Total by class of loans, Recorded Investment	349	515
Total by class of loans, Average Recorded Investment	350	542
Total by class of loans, Interest Income Recognized
Related Allowance	20	20
Real Estate, Mortgage [Member]
With no related allowance recorded, Unpaid Principal Balance	4,305	8,906
With no related allowance recorded, Recorded Investment	4,305	8,906
With no related allowance recorded, Average Recorded Investment	4,401	9,075
With no related allowance recorded, Interest Income Recognized	15	29
With a related allowance recorded, Unpaid Principal Balance	258	624
With a related allowance recorded, Recorded Investment	258	624
Related Allowance	78	98
With a related allowance recorded, Average Recorded Investment	250	614
With a related allowance recorded, Interest Income Recognized	19	27
Total by class of loans, Unpaid Principal Balance	4,563	9,530
Total by class of loans, Recorded Investment	4,563	9,530
Total by class of loans, Average Recorded Investment	4,651	9,689
Total by class of loans, Interest Income Recognized	34	56
Related Allowance	78	98
Commercial And Industrial Loan [Member]
With no related allowance recorded, Unpaid Principal Balance	27	217
With no related allowance recorded, Recorded Investment	27	217
With no related allowance recorded, Average Recorded Investment	33	217
With no related allowance recorded, Interest Income Recognized
With a related allowance recorded, Unpaid Principal Balance	27	39
With a related allowance recorded, Recorded Investment	27	39
Related Allowance	4	4
With a related allowance recorded, Average Recorded Investment	33	41
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance		256
Total by class of loans, Recorded Investment		256
Total by class of loans, Average Recorded Investment		258
Total by class of loans, Interest Income Recognized
Related Allowance	$ 4	$ 4

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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