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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
	May 10, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	May 10, 2018
Goodwill, Ending Balance		$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,107,000	$ 1,728,000
Goodwill, Purchase Accounting Adjustments					$ (621,000)
Goodwill, Impairment Loss		$ 0
Prime Bank [Member]
Goodwill, Ending Balance	$ 1,100,000								$ 1,700,000	$ 2,100,000
Goodwill, Purchase Accounting Adjustments	$ (621,000)
Business Acquisition, Goodwill, Tax Deductible Period (Year)	15 years

X

- Definition

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

+ 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
-Subparagraph (SX 210.9-03(10)(1))
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-Section 45
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X

- 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.

+ References

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-SubTopic 20
-Section 50
-Paragraph 2
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- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
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