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Note 8 - Loans and Related Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Beginning balance $ 14,438,000 $ 14,342,000
Charge-offs (112,000) (61,000)
Recoveries 120,000 211,000
Provision 334,000 0
Ending balance 20,162,000 14,492,000
Accounting Standards Update 2016-13 [Member]    
Provision 334,000  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 5,382,000  
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]    
Beginning balance 2,203,000 1,836,000
Charge-offs 0 0
Recoveries 1,000 1,000
Provision (337,000) (72,000)
Ending balance 2,678,000 1,765,000
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 811,000  
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]    
Beginning balance 5,597,000 7,431,000
Charge-offs 0 0
Recoveries 0 0
Provision 321,000 241,000
Ending balance 4,712,000 7,672,000
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance (1,206,000)  
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]    
Beginning balance 662,000 454,000
Charge-offs 0 0
Recoveries 0 0
Provision 118,000 (35,000)
Ending balance 1,371,000 419,000
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 591,000  
Residential Portfolio Segment [Member]    
Beginning balance 2,047,000 1,740,000
Charge-offs 0 0
Recoveries 0 27,000
Provision 176,000 34,000
Ending balance 4,967,000 1,801,000
Residential Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 2,744,000  
Commercial And Industrial [Member]    
Beginning balance 1,483,000 882,000
Charge-offs (54,000) (30,000)
Recoveries 10,000 149,000
Provision 60,000 (97,000)
Ending balance 3,819,000 904,000
Commercial And Industrial [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 2,320,000  
Home Equity Lines of Credit [Member]    
Beginning balance 1,753,000 1,452,000
Charge-offs 0 (25,000)
Recoveries 70,000 0
Provision 17,000 (72,000)
Ending balance 809,000 1,355,000
Home Equity Lines of Credit [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance (1,031,000)  
Construction and Other [Member]    
Beginning balance 609,000 533,000
Charge-offs 0 0
Recoveries 0 0
Provision (12,000) 25,000
Ending balance 1,553,000 558,000
Construction and Other [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance 956,000  
Consumer Portfolio Segment [Member]    
Beginning balance 84,000 14,000
Charge-offs (58,000) (6,000)
Recoveries 39,000 34,000
Provision (9,000) (24,000)
Ending balance 253,000 $ 18,000
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Beginning balance $ 197,000