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Note 2 - Acquisitions and Divestitures (Details Textual)		1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 11, 2019 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Combination, Acquisition Related Costs				$ 2,124,000
Provision for Loan and Lease Losses, Total				3,571,000	2,393,000
Goodwill, Impairment Loss		$ 1,490,000	$ 1,490,000		1,492,000
Highlands Bankshares, Inc. [Member]
Business Combination, Stock Conversion Ratio	0.2703
Business Combination, Consideration Transferred, Total	$ 86,647,000
Acquired Loan, Fair Value Adjustments	(14,700,000)
Deferred Loan Fees Excluded from Fair Value Adjustment of Acquired Loan	3,270,000
Death Benefits Payable, Fair Value Adjustment	320,000
Lease Liability, Fair Value Adjustment	(37,000)
Reserve for Unfunded Commitments, Fair Value Adjustment	$ (85,000)
Business Combination, Acquisition Related Costs				2,120,000
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed				7,160,000
Provision for Loan and Lease Losses, Total				$ 738,000	$ 1,840,000

X

- Definition

The increase (decrease) to acquired loan related to the fair value adjustments.

+ References

No definition available.

+ Details

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X

- Definition

The stock conversion ratio for a business combination.

+ References

No definition available.

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X

- Definition

The increase (decrease) to death benefits payable related to the fair value adjustment.

+ References

No definition available.

+ Details

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X

- Definition

The amount of deferred loan fees that excluded from the fair value adjustment of acquired loan.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) to lease liability related to the fair value adjustment.

+ References

No definition available.

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- Definition

The increase (decrease) to reserve for unfunded commitments related to the fair value adjustment.

+ References

No definition available.

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
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- Definition

For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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