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Note 4 - Allowance for Loan Losses and Impaired Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Recorded investment with no related allowance [1] $ 2,775 $ 2,775 $ 2,580
Unpaid principal balance with no related allowance 3,433 3,433 3,151
Average recorded investment with no related allowance 2,810 2,881 2,731
Interest income recognized with no related allowance 129 211 18
Recorded investment with related allowance [1] 3,108 3,108 3,589
Unpaid principal balance with related allowance 3,301 3,301 3,827
Related allowance 157 157 192
Average recorded investment with related allowance 3,140 3,145 5,015
Interest income recognized with related allowance 50 140 270
Average recorded investment 5,950 6,026 7,746
Recorded investment [1] 5,883 5,883 6,169
Unpaid principal balance 6,734 6,734 6,978
Interest income recognized 179 351 288
Construction and Development Loan [Member]      
Recorded investment with no related allowance [1] 426 426  
Unpaid principal balance with no related allowance 425 425 0
Average recorded investment with no related allowance 426 218 0
Interest income recognized with no related allowance   (5)  
Interest income recognized with no related allowance     0
Recorded investment with related allowance [1] 449 449 501
Unpaid principal balance with related allowance 449 449 501
Related allowance 13 13 27
Average recorded investment with related allowance 456 469 522
Interest income recognized with related allowance 7 20 31
Average recorded investment 882 687 522
Recorded investment [1] 875 875 501
Unpaid principal balance 874 874 501
Interest income recognized 7 15 31
Farmland Loan [Member]      
Recorded investment with no related allowance [1] 2,349 2,349 2,580
Unpaid principal balance with no related allowance 3,008 3,008 3,151
Average recorded investment with no related allowance 2,384 2,464 2,731
Interest income recognized with no related allowance 129 191 18
Recorded investment with related allowance [1] 126 126 127
Unpaid principal balance with related allowance 142 142 144
Related allowance 2 2 2
Average recorded investment with related allowance 126 126 375
Interest income recognized with related allowance 2 6 11
Average recorded investment 2,510 2,590 3,106
Recorded investment [1] 2,475 2,475 2,707
Unpaid principal balance 3,150 3,150 3,295
Interest income recognized 131 197 29
Residential Loan [Member]      
Unpaid principal balance with no related allowance     0
Average recorded investment with no related allowance   198 0
Interest income recognized with no related allowance   25 0
Recorded investment with related allowance [1] 2,425 2,425 2,906
Unpaid principal balance with related allowance 2,602 2,602 3,082
Related allowance 136 136 159
Average recorded investment with related allowance   2,469 4,057
Interest income recognized with related allowance 39 108 222
Average recorded investment 2,448 2,667 4,057
Recorded investment [1]     2,906
Unpaid principal balance     3,082
Interest income recognized   133 222
Commercial Mortgage Loan [Member]      
Unpaid principal balance with no related allowance     0
Average recorded investment with no related allowance     0
Interest income recognized with no related allowance     0
Recorded investment with related allowance [1] 71 71 8
Unpaid principal balance with related allowance 71 71 53
Related allowance 4 4 1
Average recorded investment with related allowance 71 40 10
Interest income recognized with related allowance 1 4 3
Average recorded investment 71 40 10
Recorded investment [1] 71 71 8
Unpaid principal balance 71 71 53
Interest income recognized 1 4 3
Commercial and Agricultural Loan [Member]      
Unpaid principal balance with no related allowance     0
Average recorded investment with no related allowance     0
Interest income recognized with no related allowance     0
Recorded investment with related allowance [1] 37 37 46
Unpaid principal balance with related allowance 37 37 46
Related allowance 2 2 3
Average recorded investment with related allowance 39 41 49
Interest income recognized with related allowance 1 2 3
Average recorded investment 39 41 49
Recorded investment [1] 37 37 46
Unpaid principal balance 37 37 46
Interest income recognized 1 2 3
Consumer and Other Loan [Member]      
Unpaid principal balance with no related allowance     0
Average recorded investment with no related allowance 0 1 0
Interest income recognized with no related allowance 0 0 0
Recorded investment with related allowance [1]     1
Unpaid principal balance with related allowance 0 0 1
Related allowance 0 0 0
Average recorded investment with related allowance 0 0 2
Interest income recognized with related allowance 0 0 0
Average recorded investment 0 1 2
Recorded investment [1]     1
Unpaid principal balance 0 0 1
Interest income recognized $ 0 $ 0 $ 0
[1] Recorded investment is the loan balance, net of any charge-offs