Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss	$ 12,947,000		$ 10,717,000	$ 10,352,000
Off-Balance-Sheet, Credit Loss, Liability	849,000		341,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss		$ 529,000	529,000
Financing Receivable, Allowance for Credit Loss, Income Tax Effect for Change in Accounting Principle	156,000
Off-Balance-Sheet, Credit Loss, Liability	257,000
Provision for Off Balance Sheet Commitments, Income Tax Effect for Change in Accounting Principle.	$ 76,000
Minimum [Member] | Commercial Portfolio Segment [Member]
Financing Receivables, Maturity Period (Year)	10 years
Financing Receivables, Amortization Period (Year)	5 years
Maximum [Member] | Commercial Portfolio Segment [Member]
Financing Receivables, Maturity Period (Year)	25 years
Financing Receivables, Amortization Period (Year)	30 years
Accrued Interest Receivable and Other Assets [Member] | Plumas Statutory Trust I [Member]
Equity Method Investments			374,000
Accrued Interest Receivable and Other Assets [Member] | Plumas Statutory Trust II [Member]
Equity Method Investments			$ 188,000