Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Securities available for sale	$ 259,445,000	$ 261,841,000
Equity Securities, FV-NI	1,800,000	1,700,000
Reported Value Measurement [Member]
Cash and cash equivalents	60,526,000	41,112,000
Interest-bearing time deposits	6,245,000	7,710,000
Securities available for sale	259,445,000	261,841,000
Loans held for sale	3,962,000	2,849,000
Loans, net	459,928,000	434,260,000
FHLB and other restricted stock	1,988,000	1,988,000
Accrued interest receivable	2,987,000	2,828,000
Equity Securities, FV-NI	1,832,000	1,715,000
Deposits	734,627,000	701,646,000
Accrued interest payable	172,000	150,000
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	60,526,000	41,112,000
Interest-bearing time deposits	6,340,000	7,650,000
Securities available for sale	259,445,000	261,841,000
Loans held for sale	4,033,000	2,900,000
Loans, net	472,960,000	427,200,000
Accrued interest receivable	2,987,000	2,828,000
Equity Securities, FV-NI	1,832,000	1,715,000
Deposits	733,775,000	699,864,000
Accrued interest payable	172,000	150,000
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	60,526,000	41,112,000
Interest-bearing time deposits
Securities available for sale
Loans held for sale
Loans, net
Accrued interest receivable
Equity Securities, FV-NI	1,832,000	1,715,000
Deposits
Accrued interest payable
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Interest-bearing time deposits	6,340,000	7,650,000
Securities available for sale	259,445,000	261,841,000
Loans held for sale	4,033,000	2,900,000
Loans, net
Accrued interest receivable	2,987,000	2,828,000
Equity Securities, FV-NI
Deposits
Accrued interest payable	172,000	150,000
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	472,960,000	427,200,000
Accrued interest receivable
Equity Securities, FV-NI
Deposits	733,775,000	699,864,000
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.

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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

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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 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&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.

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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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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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