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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Recorded investment with no allowance $ 2,027,000 $ 3,168,000 $ 3,393,000
Unpaid principal balance with no allowance 2,172,000 3,338,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 2,671,000 3,077,000  
Interest income recognized with no allowance 65,000 81,000 62,000
Recorded investment with allowance 288,000 0  
Unpaid principal balance with allowance 296,000 0  
Related allowance 7,000 0  
Average recorded investment with allowance 241,000 193,000  
Interest income recognized with allowance 0 0  
Recorded investment 2,315,000 3,168,000  
Unpaid principal balance 2,468,000 3,338,000  
Average recorded investment 2,912,000 3,270,000  
Interest income recognized 65,000 81,000 62,000
Interest income recognized 65,000 81,000 62,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 1,034,000 1,728,000 1,973,000
Unpaid principal balance with no allowance 1,163,000 1,902,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 1,529,000 1,638,000  
Interest income recognized with no allowance 21,000 22,000 17,000
Recorded investment with allowance 0 0 87,000
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 117,000  
Interest income recognized with allowance 0 0 0
Recorded investment 1,034,000 1,728,000 2,060,000
Unpaid principal balance 1,163,000 1,902,000  
Average recorded investment 1,529,000 1,755,000  
Interest income recognized 21,000 22,000 17,000
Interest income recognized 21,000 22,000 17,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 102,000 97,000 147,000
Unpaid principal balance with no allowance 104,000 97,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 100,000 101,000  
Interest income recognized with no allowance 0 1,000 0
Recorded investment with allowance 0 0 0
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 10,000 0  
Interest income recognized with allowance 0 0 0
Recorded investment 102,000 97,000 147,000
Unpaid principal balance 104,000 97,000  
Average recorded investment 110,000 101,000  
Interest income recognized 0 1,000 0
Interest income recognized 0 1,000 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 0 0 209,000
Unpaid principal balance with no allowance 0 0  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 0 0  
Interest income recognized with no allowance 0 0 0
Recorded investment with allowance 0 0 0
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0  
Interest income recognized with allowance 0 0 0
Recorded investment 0 0 209,000
Unpaid principal balance 0 0  
Average recorded investment 0 0  
Interest income recognized 0 0 0
Interest income recognized 0 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 702,000 779,000 446,000
Unpaid principal balance with no allowance 716,000 784,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 740,000 836,000  
Interest income recognized with no allowance 34,000 36,000 33,000
Recorded investment with allowance 0 0 81,000
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0  
Interest income recognized with allowance 0 0 0
Recorded investment 702,000 779,000 527,000
Unpaid principal balance 716,000 784,000  
Average recorded investment 740,000 836,000  
Interest income recognized 34,000 36,000 33,000
Interest income recognized 34,000 36,000 33,000
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 174,000 211,000 330,000
Unpaid principal balance with no allowance 174,000 210,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 191,000 249,000  
Interest income recognized with no allowance 8,000 9,000 11,000
Recorded investment with allowance 0 0 58,000
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 76,000  
Interest income recognized with allowance 0 0 0
Recorded investment 174,000 211,000 388,000
Unpaid principal balance 174,000 210,000  
Average recorded investment 191,000 325,000  
Interest income recognized 8,000 9,000 11,000
Interest income recognized 8,000 9,000 11,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 15,000 353,000 29,000
Unpaid principal balance with no allowance 15,000 345,000  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 111,000 234,000  
Interest income recognized with no allowance 2,000 13,000 1,000
Recorded investment with allowance 288,000 0 13,000
Unpaid principal balance with allowance 296,000 0  
Related allowance 7,000 0  
Average recorded investment with allowance 231,000 0  
Interest income recognized with allowance 0 0 0
Recorded investment 303,000 353,000 42,000
Unpaid principal balance 311,000 345,000  
Average recorded investment 342,000 234,000  
Interest income recognized 2,000 13,000 1,000
Interest income recognized 2,000 13,000 1,000
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 0 0 20,000
Unpaid principal balance with no allowance 0 0  
Related allowance with no allowance 0 0  
Average recorded investment with no allowance 0 19,000  
Interest income recognized with no allowance 0 0  
Recorded investment with allowance 0 0 0
Unpaid principal balance with allowance 0 0  
Related allowance 0 0  
Average recorded investment with allowance 0 0  
Interest income recognized with allowance 0 0 0
Recorded investment 0 0 20,000
Unpaid principal balance 0 0  
Average recorded investment 0 19,000  
Interest income recognized 0 0 0
Interest income recognized $ 0 $ 0 $ 0