Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Securities available for sale	$ 253,182,000	$ 254,562,000
Equity Securities, FV-NI	1,400,000	1,700,000
Reported Value Measurement [Member]
Cash and cash equivalents	59,722,000	51,360,000
Interest-bearing time deposits	6,490,000	6,490,000
Securities available for sale	253,182,000	254,562,000
Loans held for sale	3,085,000	4,176,000
Loans, net	465,292,000	466,694,000
FHLB and other restricted stock	1,988,000	1,988,000
Accrued interest receivable	2,863,000	3,076,000
Equity Securities, FV-NI	1,352,000	1,746,000
Deposits	722,618,000	722,177,000
Accrued interest payable	219,000	210,000
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	59,722,000	51,360,000
Interest-bearing time deposits	6,835,000	6,654,000
Securities available for sale	253,182,000	254,562,000
Loans held for sale	3,142,000	4,243,000
Loans, net	476,293,000	482,119,000
Accrued interest receivable	2,863,000	3,076,000
Equity Securities, FV-NI	1,352,000	1,746,000
Deposits	723,217,000	721,729,000
Accrued interest payable	219,000	210,000
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	59,722,000	51,360,000
Interest-bearing time deposits
Securities available for sale
Loans held for sale
Loans, net
Accrued interest receivable
Equity Securities, FV-NI	1,352,000	1,746,000
Deposits
Accrued interest payable
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Interest-bearing time deposits	6,835,000	6,654,000
Securities available for sale	253,182,000	254,562,000
Loans held for sale	3,142,000	4,243,000
Loans, net
Accrued interest receivable	2,863,000	3,076,000
Equity Securities, FV-NI
Deposits
Accrued interest payable	219,000	210,000
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Interest-bearing time deposits
Securities available for sale
Loans held for sale
Loans, net	476,293,000	482,119,000
Accrued interest receivable
Equity Securities, FV-NI
Deposits	723,217,000	721,729,000
Accrued interest payable

Represents the fair value of accrued interest receivable.

No definition available.

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Represents the fair value of interest payable.

+ References

No definition available.

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Fair value portion of interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

+ References

No definition available.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

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-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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No definition available.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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