Note C - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Increase (Decrease) in Other Loans	$ 82
Change In Troubled Debt Restructurings	1.00%
Impaired Financing Receivable, Related Allowance	$ 807	$ 98	$ 94
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 941	$ 758
Financing Receivable, Modifications, Number of Contracts	2	0	2
Financing Receivable, Troubled Debt Restructuring, Provision	$ 185
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0		$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0		0
Financing Receivable, Modified During Period, Amount	$ 50,586	$ 28,738
Minimum Loan Balance For Loans Evaluated by Risk Categories	$ 750
Percentage of Loan Portfolio	100.00%	100.00%
Troubled Debt Restructurings [Member]
Impaired Financing Receivable, Related Allowance	$ 227	$ 98
Unsecured [Member]
Percentage of Loan Portfolio	5.00%	5.02%
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 68	$ 134
Mortgage Loans in Process of Foreclosure, Amount	$ 1,780	$ 2,375
Percentage of Loan Portfolio	40.15%	39.13%
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default		$ 362
Percentage of Loan Portfolio	28.75%	27.84%

The change during the period in loans modified as troubled debt restructurings.

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The amount of financing receivable modified during the period.

+ References

No definition available.

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- Definition

Reflects the amount of provision related to a troubled debt restructuring.

+ References

No definition available.

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Minimum loan balance for impaired loans on nonaccrual status or nonperforming in nature.

+ References

No definition available.

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The percentage of the loan portfolio.

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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- Definition

Amount of allowance for credit losses related to recorded investment.

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- Definition

Amount of increase (decrease) in loans classified as other.

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Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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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.

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