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Note 6 - Allowance for Loan Losses and Impaired Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Recorded investment with no related allowance $ 4,149 $ 3,369
Unpaid principal balance with no related allowance 4,149 3,393
Average recorded investment with no related allowance 4,426 3,971
Interest income recognized with no related allowance 65 36
Recorded investment with related allowance [1] 3,612 6,929
Unpaid principal balance with related allowance 3,807 7,169
Related allowance 174 300
Average recorded investment with related allowance 6,088 7,795
Interest income recognized with related allowance 314 393
Recorded investment 7,761 10,298
Unpaid principal balance 7,956 10,562
Average recorded investment 10,514 11,766
Interest income recognized 379 429
Construction and Development Loan [Member]    
Recorded investment with no related allowance [1]
Unpaid principal balance with no related allowance
Average recorded investment with no related allowance
Interest income recognized with no related allowance
Recorded investment with related allowance [1] 72 69
Unpaid principal balance with related allowance 72 69
Related allowance 3 4
Average recorded investment with related allowance 76 306
Interest income recognized with related allowance 6 11
Recorded investment [1] 72 69
Unpaid principal balance 72 69
Average recorded investment 76 306
Interest income recognized 6 11
Farmland Loan [Member]    
Recorded investment with no related allowance [1] 3,240 3,284
Unpaid principal balance with no related allowance 3,240 3,284
Average recorded investment with no related allowance 3,505 3,523
Interest income recognized with no related allowance 25 23
Recorded investment with related allowance [1] 150 1,539
Unpaid principal balance with related allowance 150 1,539
Related allowance 2 38
Average recorded investment with related allowance 1,545 1,568
Interest income recognized with related allowance 70 86
Recorded investment [1] 3,390 4,823
Unpaid principal balance 3,390 4,823
Average recorded investment 5,050 5,091
Interest income recognized 95 109
Residential Loan [Member]    
Recorded investment with no related allowance [1] 909 85
Unpaid principal balance with no related allowance 909 85
Average recorded investment with no related allowance 921 448
Interest income recognized with no related allowance 40 13
Recorded investment with related allowance [1] 3,345 5,005
Unpaid principal balance with related allowance 3,495 5,162
Related allowance 166 241
Average recorded investment with related allowance 4,161 5,348
Interest income recognized with related allowance 225 266
Recorded investment [1] 4,254 5,090
Unpaid principal balance 4,404 5,247
Average recorded investment 5,082 5,796
Interest income recognized 265 279
Commercial Mortgage Loan [Member]    
Recorded investment with no related allowance [1]
Unpaid principal balance with no related allowance
Average recorded investment with no related allowance
Interest income recognized with no related allowance
Recorded investment with related allowance [1] 11 275
Unpaid principal balance with related allowance 56 358
Related allowance 1 15
Average recorded investment with related allowance 268 522
Interest income recognized with related allowance 11 27
Recorded investment [1] 11 275
Unpaid principal balance 56 358
Average recorded investment 268 522
Interest income recognized 11 27
Commercial and Agricultural Loan [Member]    
Recorded investment with no related allowance [1]
Unpaid principal balance with no related allowance 24
Average recorded investment with no related allowance
Interest income recognized with no related allowance
Recorded investment with related allowance [1] 31 37
Unpaid principal balance with related allowance 31 37
Related allowance 1 2
Average recorded investment with related allowance 34 47
Interest income recognized with related allowance 2 3
Recorded investment [1] 31 37
Unpaid principal balance 31 61
Average recorded investment 34 47
Interest income recognized 2 3
Consumer and Other Loan [Member]    
Recorded investment with no related allowance [1]
Unpaid principal balance with no related allowance
Average recorded investment with no related allowance
Interest income recognized with no related allowance
Recorded investment with related allowance [1] 3 4
Unpaid principal balance with related allowance 3 4
Related allowance 1
Average recorded investment with related allowance 4 4
Interest income recognized with related allowance
Recorded investment [1] 3 4
Unpaid principal balance 3 4
Average recorded investment 4 4
Interest income recognized
[1] Recorded investment is the loan balance, net of any charge-offs