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Note 3 - Loans - Analysis of the Credit Risk Profile of Each Loan Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Loans $ 972,974 $ 917,967 $ 969,430
Current period gross write-offs, total 414 977 3,993
Real Estate 1 [Member] | Construction and Land Development [Member]      
Loans, current year 419    
Loans, one year before 1,716    
Loans, two years before 2,809    
Loans, three years before 4,183    
Loans, four years before 3,330    
Loans, prior 4,742    
Loans, revolving 36,165    
Loans 53,364 48,610 52,680
Current period gross write-offs, current year 0    
Current period gross write-offs. one year before 0    
Current period gross write-offs, two years before 4    
Current period gross write-offs, three years before 0    
Current period gross write-offs, four years before 0    
Current period gross write-offs, prior 0    
Current period gross write-offs, revolving 0    
Current period gross write-offs, total 4 (0) (0)
Real Estate 1 [Member] | Construction and Land Development [Member] | Pass [Member]      
Loans, current year 419    
Loans, one year before 1,716    
Loans, two years before 2,809    
Loans, three years before 4,183    
Loans, four years before 3,330    
Loans, prior 4,705    
Loans, revolving 36,165    
Loans 53,327    
Real Estate 1 [Member] | Construction and Land Development [Member] | Special Mention [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Real Estate 1 [Member] | Construction and Land Development [Member] | Substandard [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 37    
Loans, revolving 0    
Loans 37    
Real Estate 1 [Member] | Construction and Land Development [Member] | Doubtful [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]      
Loans, current year 3,937    
Loans, one year before 37,427    
Loans, two years before 66,054    
Loans, three years before 58,713    
Loans, four years before 37,782    
Loans, prior 94,422    
Loans, revolving 48,679    
Loans 347,014 334,302 344,369
Current period gross write-offs, current year 0    
Current period gross write-offs. one year before 0    
Current period gross write-offs, two years before 0    
Current period gross write-offs, three years before 0    
Current period gross write-offs, four years before 0    
Current period gross write-offs, prior 10    
Current period gross write-offs, revolving 0    
Current period gross write-offs, total 10 (0) 59
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Pass [Member]      
Loans, current year 3,937    
Loans, one year before 37,427    
Loans, two years before 65,965    
Loans, three years before 58,505    
Loans, four years before 37,782    
Loans, prior 93,662    
Loans, revolving 48,679    
Loans 345,957    
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Special Mention [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Substandard [Member]      
Loans, current year 0    
Loans, one year before    
Loans, two years before 89    
Loans, three years before 208    
Loans, four years before 0    
Loans, prior 760    
Loans, revolving 0    
Loans 1,057    
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Doubtful [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Real Estate 1 [Member] | Other Real Estate Loans [Member]      
Loans, current year 2,876    
Loans, one year before 49,906    
Loans, two years before 94,347    
Loans, three years before 92,627    
Loans, four years before 40,803    
Loans, prior 152,384    
Loans, revolving 12,142    
Loans 445,085 416,001 447,272
Current period gross write-offs, current year 0    
Current period gross write-offs. one year before 0    
Current period gross write-offs, two years before 0    
Current period gross write-offs, three years before 0    
Current period gross write-offs, four years before 0    
Current period gross write-offs, prior 0    
Current period gross write-offs, revolving 0    
Current period gross write-offs, total 0 (0) 34
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Pass [Member]      
Loans, current year 2,876    
Loans, one year before 49,906    
Loans, two years before 94,347    
Loans, three years before 92,627    
Loans, four years before 40,803    
Loans, prior 152,384    
Loans, revolving 12,142    
Loans 445,085    
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Special Mention [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Substandard [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving    
Loans 0    
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Doubtful [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Commercial and Industrial Loans [Member]      
Loans, current year 7,403    
Loans, one year before 22,975    
Loans, two years before 25,393    
Loans, three years before 18,718    
Loans, four years before 2,449    
Loans, prior 11,317    
Loans, revolving 25,307    
Loans 113,562 110,937 113,074
Current period gross write-offs, current year 0    
Current period gross write-offs. one year before 317    
Current period gross write-offs, two years before 0    
Current period gross write-offs, three years before 0    
Current period gross write-offs, four years before 0    
Current period gross write-offs, prior 0    
Current period gross write-offs, revolving 0    
Current period gross write-offs, total 317 851 3,452
Commercial and Industrial Loans [Member] | Pass [Member]      
Loans, current year 7,403    
Loans, one year before 22,279    
Loans, two years before 19,892    
Loans, three years before 17,278    
Loans, four years before 2,449    
Loans, prior 10,365    
Loans, revolving 25,307    
Loans 104,973    
Commercial and Industrial Loans [Member] | Special Mention [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 1,371    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 1,371    
Commercial and Industrial Loans [Member] | Substandard [Member]      
Loans, current year 0    
Loans, one year before 696    
Loans, two years before 4,130    
Loans, three years before 1,440    
Loans, four years before 0    
Loans, prior 952    
Loans, revolving 0    
Loans 7,218    
Commercial and Industrial Loans [Member] | Doubtful [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Consumer and Other Loans [Member]      
Loans, current year 1,951    
Loans, one year before 2,427    
Loans, two years before 1,027    
Loans, three years before 326    
Loans, four years before 1,328    
Loans, prior 2,116    
Loans, revolving 4,774    
Loans 13,949 8,117 12,035
Current period gross write-offs, current year 70    
Current period gross write-offs. one year before 4    
Current period gross write-offs, two years before 6    
Current period gross write-offs, three years before 3    
Current period gross write-offs, four years before 0    
Current period gross write-offs, prior 0    
Current period gross write-offs, revolving 0    
Current period gross write-offs, total 83 $ 126 $ 448
Consumer and Other Loans [Member] | Pass [Member]      
Loans, current year 1,951    
Loans, one year before 2,427    
Loans, two years before 1,027    
Loans, three years before 326    
Loans, four years before 1,328    
Loans, prior 2,116    
Loans, revolving 4,774    
Loans 13,949    
Consumer and Other Loans [Member] | Special Mention [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Consumer and Other Loans [Member] | Substandard [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans 0    
Consumer and Other Loans [Member] | Doubtful [Member]      
Loans, current year 0    
Loans, one year before 0    
Loans, two years before 0    
Loans, three years before 0    
Loans, four years before 0    
Loans, prior 0    
Loans, revolving 0    
Loans $ 0