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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Recorded investment with no allowance $ 2,558 $ 3,533  
Unpaid principal balance with no allowance 2,818 3,838  
Related allowance with no allowance    
Average recorded investment with no allowance 3,154 3,198 $ 3,378
Interest income recognized with no allowance 62 55 48
Recorded investment with allowance 189 252  
Unpaid principal balance with allowance 211 258  
Related allowance 16 48  
Average recorded investment with allowance 239 288 214
Interest income recognized with allowance
Recorded investment 2,747 3,785  
Unpaid principal balance 3,029 4,096  
Average recorded investment 3,393 3,486 3,592
Interest income recognized 62 55 48
Interest income recognized 62 55 48
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 1,737 2,170  
Unpaid principal balance with no allowance 1,986 2,409  
Related allowance with no allowance    
Average recorded investment with no allowance 1,973 2,335 2,437
Interest income recognized with no allowance 17 23 28
Recorded investment with allowance 189 14  
Unpaid principal balance with allowance 211 15  
Related allowance 16 3  
Average recorded investment with allowance 87 203 140
Interest income recognized with allowance
Recorded investment 1,926 2,184  
Unpaid principal balance 2,197 2,424  
Average recorded investment 2,060 2,538 2,577
Interest income recognized 17 23 28
Interest income recognized 17 23 28
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 115 152  
Unpaid principal balance with no allowance 117 153  
Related allowance with no allowance    
Average recorded investment with no allowance 147 135
Interest income recognized with no allowance 2
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance
Interest income recognized with allowance
Recorded investment 115 152  
Unpaid principal balance 117 153  
Average recorded investment 147 135
Interest income recognized 2
Interest income recognized 2
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 521  
Unpaid principal balance with no allowance 521  
Related allowance with no allowance    
Average recorded investment with no allowance 209 104
Interest income recognized with no allowance
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance
Interest income recognized with allowance
Recorded investment 521  
Unpaid principal balance 521  
Average recorded investment 209 104
Interest income recognized
Interest income recognized
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 353 255  
Unpaid principal balance with no allowance 352 260  
Related allowance with no allowance 1    
Average recorded investment with no allowance 446 325 686
Interest income recognized with no allowance 33 16 16
Recorded investment with allowance 211  
Unpaid principal balance with allowance 213  
Related allowance 44  
Average recorded investment with allowance 81 42
Interest income recognized with allowance
Recorded investment 353 466  
Unpaid principal balance 352 473  
Average recorded investment 527 367 686
Interest income recognized 33 16 16
Interest income recognized 33 16 16
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 249 400  
Unpaid principal balance with no allowance 257 451  
Related allowance with no allowance    
Average recorded investment with no allowance 330 237 57
Interest income recognized with no allowance 11 14 1
Recorded investment with allowance 27  
Unpaid principal balance with allowance 30  
Related allowance 1  
Average recorded investment with allowance 58 38 40
Interest income recognized with allowance
Recorded investment 249 427  
Unpaid principal balance 257 481  
Average recorded investment 388 275 97
Interest income recognized 11 14 1
Interest income recognized 11 14 1
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 56 35  
Unpaid principal balance with no allowance 56 44  
Related allowance with no allowance    
Average recorded investment with no allowance 29 57 194
Interest income recognized with no allowance 1 1 1
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 13 5 20
Interest income recognized with allowance
Recorded investment 56 35  
Unpaid principal balance 56 44  
Average recorded investment 42 62 214
Interest income recognized 1 1 1
Interest income recognized 1 1 1
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 48  
Unpaid principal balance with no allowance 50  
Related allowance with no allowance    
Average recorded investment with no allowance 20 5 4
Interest income recognized with no allowance 1
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 14
Interest income recognized with allowance
Recorded investment 48  
Unpaid principal balance 50  
Average recorded investment 20 5 18
Interest income recognized 1
Interest income recognized $ 1