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Note 8 - Business Combination, Goodwill and Other Intangible Assets (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	May 10, 2019	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 10, 2018
Goodwill, Ending Balance		$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,728,000
Goodwill, Purchase Accounting Adjustments			0	0	(621,000)
Amortization of Intangible Assets, Total			47,000	74,000	75,000
Impairment of Intangible Assets, Finite-lived			$ 0	206,000	0
Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			10 years
Amortization of Intangible Assets, Total			$ 47,000	74,000	$ 75,000
Impairment of Intangible Assets, Finite-lived				206,000
Prime Bank [Member]
Goodwill, Ending Balance	$ 1,100,000					$ 1,700,000	$ 2,100,000
Goodwill, Purchase Accounting Adjustments	$ (621,000)		$ 0
Business Acquisition, Goodwill, Tax Deductible Period (Year)			15 years
Prime Bank [Member] | Project Expenses [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred				$ 556,000
American Challenger [Member]
Business Combination, Acquisition Related Costs		$ 1,900,000	$ 1,900,000
American Challenger [Member] | Project Expenses [Member]
Business Combination, Acquisition Related Costs			$ 1,900,000

X

- Definition

The period in which the amount of goodwill arising from a business combination is deductible for tax purposes.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Topic 350
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 805
-SubTopic 10
-Section 25
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X

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

+ References

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X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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.

+ References

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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