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Note 1 - General (Details Textual) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jul. 01, 2021	Jun. 30, 2020	Sep. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Deferred Payments	$ 0			$ 0			$ 0	$ 0	$ 0
Financing Receivable, Modifications, Interest Only Payments	13,300			13,300				13,300
Loans and Leases Receivable, Net Amount, Total	816,977			816,977	$ 622,429	[1]		816,977
Business Combination, Consideration Transferred, Total								117,566
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	351,468			351,468				351,468
The Bank of Fincastle [Member]
Business Combination, Consideration Transferred, Total		$ 33,821
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total		$ 269,517
Smartbank [Member]
Business Combination, Consideration Transferred, Total	83,745
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total	81,951			81,951				81,951
SBA CARES Act Paycheck Protection Program [Member]
Loans and Leases Receivable, Net Amount, Total	22,800			22,800				22,800
Amortization of Deferred Loan Origination Fees, Net				737			$ 247	1,800	$ 429
Loans and Leases Receivable, Deferred Income, Total	652			652				652
SBA CARES Act Paycheck Protection Program [Member] | Maturing in Second and Third Quarters of 2022 [Member]
Loans and Leases Receivable, Net Amount, Total	1,300			1,300				1,300
SBA CARES Act Paycheck Protection Program [Member] | Maturing in First and Second Quarters of 2026 [Member]
Loans and Leases Receivable, Net Amount, Total	21,500			21,500				21,500
Lodging Sector [Member]
Financing Receivable, Modifications, Interest Only Payments	11,600			11,600				11,600
Leisure Sector [Member]
Financing Receivable, Modifications, Interest Only Payments	1,700			1,700				1,700
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Interest Only Payments	13,200			13,200				13,200
Commercial and Industrial Loans [Member]
Financing Receivable, Modifications, Interest Only Payments	$ 83,000			$ 83,000				$ 83,000
Minimum [Member]
Financing Receivable, Modifications, Interest Only Payments, Period (Month)					6 months
Maximum [Member]
Financing Receivable, Modifications, Interest Only Payments, Period (Month)					24 months
Subordinated Debt [Member]
Proceeds from Issuance of Debt			$ 5,000
[1] Derived from audited consolidated financial statements.

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