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Note 4 - Loan Receivables and Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Balance $ 9,929,000 $ 10,362,000 $ 9,905,000 $ 10,584,000  
Charge-offs (366,000) (6,000) (651,000) (358,000)  
Recoveries 189,000 23,000 223,000 153,000  
Provisions (credits) 200,000 (300,000) 475,000 (300,000)  
Balance 9,952,000 10,079,000 9,952,000 10,079,000  
Allowance for loan losses: Individually evaluated for impairment 6,100,000   6,100,000   $ 2,300,000
Allowance for loan losses: Collectively evaluated for impairment 2,000   2,000   7,000
Loans receivable, gross: Individually evaluated for impairment 19,400,000   19,400,000   23,200,000
Loans receivable, gross: Collectively evaluated for impairment 524,000   524,000   590,000
Total loans receivable, gross 862,870,000   862,870,000   739,488,000
Business Activities Loans [Member]          
Balance     9,905,000    
Balance 9,952,000   9,952,000    
Allowance for loan losses: Individually evaluated for impairment 6,061,000   6,061,000   2,292,000
Allowance for loan losses: Collectively evaluated for impairment 3,891,000   3,891,000   7,613,000
Loans receivable, gross: Individually evaluated for impairment 19,354,000   19,354,000   23,212,000
Loans receivable, gross: Collectively evaluated for impairment 843,516,000   843,516,000   716,276,000
Total loans receivable, gross 862,870,000   862,870,000   739,488,000
Commercial Real Estate Portfolio Segment [Member]          
Balance 4,980,000 4,079,000 5,063,000 4,485,000  
Charge-offs 0 0 0 (51,000)  
Recoveries 154,000 0 154,000 0  
Provisions (credits) 1,653,000 607,000 1,570,000 252,000  
Balance 6,787,000 4,686,000 6,787,000 4,686,000  
Total loans receivable, gross 438,822,000   438,822,000   365,247,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     5,063,000    
Balance 6,787,000   6,787,000    
Allowance for loan losses: Individually evaluated for impairment 5,072,000   5,072,000   1,567,000
Allowance for loan losses: Collectively evaluated for impairment 1,715,000   1,715,000   3,496,000
Loans receivable, gross: Individually evaluated for impairment 11,270,000   11,270,000   15,704,000
Loans receivable, gross: Collectively evaluated for impairment 427,552,000   427,552,000   349,543,000
Total loans receivable, gross 438,822,000   438,822,000   365,247,000
Residential Portfolio Segment [Member]          
Balance 1,395,000 2,003,000 1,700,000 1,379,000  
Charge-offs 0 0 0 (3,000)  
Recoveries 3,000 2,000 4,000 2,000  
Provisions (credits) (930,000) 130,000 (1,236,000) 757,000  
Balance 468,000 2,135,000 468,000 2,135,000  
Total loans receivable, gross 131,182,000   131,182,000   158,591,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     1,700,000    
Balance 468,000   468,000    
Allowance for loan losses: Individually evaluated for impairment 5,000   5,000   3,000
Allowance for loan losses: Collectively evaluated for impairment 463,000   463,000   1,697,000
Loans receivable, gross: Individually evaluated for impairment 2,886,000   2,886,000   2,954,000
Loans receivable, gross: Collectively evaluated for impairment 128,296,000   128,296,000   155,637,000
Total loans receivable, gross 131,182,000   131,182,000   158,591,000
Commercial Portfolio Segment [Member]          
Balance 2,316,000 3,212,000 2,532,000 3,284,000  
Charge-offs 0 (3,000) (70,000) (212,000)  
Recoveries 12,000 20,000 38,000 44,000  
Provisions (credits) (490,000) (861,000) (662,000) (748,000)  
Balance 1,838,000 2,368,000 1,838,000 2,368,000  
Total loans receivable, gross 140,364,000   140,364,000   122,810,000
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     2,532,000    
Balance 1,838,000   1,838,000    
Allowance for loan losses: Individually evaluated for impairment 984,000   984,000   722,000
Allowance for loan losses: Collectively evaluated for impairment 854,000   854,000   1,810,000
Loans receivable, gross: Individually evaluated for impairment 4,682,000   4,682,000   4,031,000
Loans receivable, gross: Collectively evaluated for impairment 135,682,000   135,682,000   118,779,000
Total loans receivable, gross 140,364,000   140,364,000   122,810,000
Consumer Portfolio Segment [Member]          
Balance 1,063,000 390,000 253,000 295,000  
Charge-offs (366,000) (3,000) (513,000) (23,000)  
Recoveries 20,000 1,000 27,000 107,000  
Provisions (credits) 22,000 (53,000) 972,000 (44,000)  
Balance 739,000 335,000 739,000 335,000  
Total loans receivable, gross 138,135,000   138,135,000   59,364,000
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     253,000    
Balance 739,000   739,000    
Allowance for loan losses: Individually evaluated for impairment 0   0   0
Allowance for loan losses: Collectively evaluated for impairment 739,000   739,000   253,000
Loans receivable, gross: Individually evaluated for impairment 516,000   516,000   523,000
Loans receivable, gross: Collectively evaluated for impairment 137,619,000   137,619,000   58,841,000
Total loans receivable, gross 138,135,000   138,135,000   59,364,000
Construction Portfolio Segment [Member]          
Balance 58,000 369,000 78,000 739,000  
Charge-offs 0 0 (68,000) (69,000)  
Recoveries 0 0 0 0  
Provisions (credits) (20,000) (138,000) 28,000 (439,000)  
Balance 38,000 231,000 38,000 231,000  
Total loans receivable, gross 12,634,000   12,634,000   21,781,000
Construction Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     78,000    
Balance 38,000   38,000    
Allowance for loan losses: Individually evaluated for impairment 0   0   0
Allowance for loan losses: Collectively evaluated for impairment 38,000   38,000   78,000
Loans receivable, gross: Individually evaluated for impairment 0   0   0
Loans receivable, gross: Collectively evaluated for impairment 12,634,000   12,634,000   21,781,000
Total loans receivable, gross 12,634,000   12,634,000   21,781,000
Construction to Permanent Portfolio Segment [Member]          
Balance 15,000 144,000 41,000 162,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provisions (credits) (10,000) (82,000) (36,000) (100,000)  
Balance 5,000 62,000 5,000 62,000  
Total loans receivable, gross 1,733,000   1,733,000   11,695,000
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]          
Balance     41,000    
Balance 5,000   5,000    
Allowance for loan losses: Individually evaluated for impairment 0   0   0
Allowance for loan losses: Collectively evaluated for impairment 5,000   5,000   41,000
Loans receivable, gross: Individually evaluated for impairment 0   0   0
Loans receivable, gross: Collectively evaluated for impairment 1,733,000   1,733,000   11,695,000
Total loans receivable, gross 1,733,000   1,733,000   11,695,000
Unallocated Financing Receivables [Member]          
Balance 102,000 165,000 238,000 240,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provisions (credits) (25,000) 97,000 (161,000) 22,000  
Balance 77,000 $ 262,000 77,000 $ 262,000  
Unallocated Financing Receivables [Member] | Business Activities Loans [Member]          
Balance     238,000    
Balance 77,000   77,000    
Allowance for loan losses: Individually evaluated for impairment 0   0   0
Allowance for loan losses: Collectively evaluated for impairment 77,000   77,000   238,000
Loans receivable, gross: Individually evaluated for impairment 0   0   0
Loans receivable, gross: Collectively evaluated for impairment 0   0   0
Total loans receivable, gross $ 0   $ 0   $ 0