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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Beginning balance       $ 3,634       $ 3,386       $ 3,415 $ 3,634 $ 3,386 $ 3,415    
Provision for loan losses $ 200 $ 455 $ 316 197 $ 298 $ 150 $ 256 211 $ 220 $ 200 $ 150 75 1,168 915 645    
Charge-offs                         (1,027) (936) (918)    
Recoveries                         290 269 244    
Ending balance 4,065       3,634       3,386       4,065 3,634 3,386    
Individually evaluated for impairment                               $ 48 $ 52
Collectively evaluated for impairment                               4,017 3,580
Acquired with deteriorated credit quality 4,065     3,634 3,634     3,386 3,386     3,415 4,065 3,634 3,386 4,065 3,634
Individually evaluated for impairment                               3,785 3,423
Collectively evaluated for impairment                               435,740 410,796
Ending balance                               439,855 414,617
Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance       2                 2        
Ending balance       2               2      
Acquired with deteriorated credit quality     2 2               2   2
Ending balance                               330 398
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]                                  
Beginning balance       219       380       527 219 380 527    
Provision for loan losses                         723 (120) (87)    
Charge-offs                         (258) (74) (118)    
Recoveries                         9 33 58    
Ending balance 693       219       380       693 219 380    
Individually evaluated for impairment                               3 35
Collectively evaluated for impairment                               690 182
Acquired with deteriorated credit quality 693     219 219     380 380     527 219 219 380 693 219
Individually evaluated for impairment                               2,184 2,907
Collectively evaluated for impairment                               134,553 133,703
Ending balance                               137,019 136,960
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance       2                 2        
Ending balance       2               2      
Acquired with deteriorated credit quality     2 2               2   2
Ending balance                               282 350
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]                                  
Beginning balance       133       56       157 133 56 157    
Provision for loan losses                         29 77 (92)    
Charge-offs                         (9)    
Recoveries                            
Ending balance 162       133       56       162 133 56    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               162 133
Acquired with deteriorated credit quality 162     133 133     56 56     157 133 133 56 162 133
Individually evaluated for impairment                               152
Collectively evaluated for impairment                               22,592 18,309
Ending balance                               22,744 18,309
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                              
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]                                  
Beginning balance       245       80       47 245 80 47    
Provision for loan losses                         (21) 165 33    
Charge-offs                            
Recoveries                            
Ending balance 224       245       80       224 245 80    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               224 245
Acquired with deteriorated credit quality 224     245 245     80 80     47 245 245 80 224 245
Individually evaluated for impairment                               521
Collectively evaluated for impairment                               24,921 21,034
Ending balance                               25,442 21,034
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                              
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]                                  
Beginning balance       1,622       1,670       1,541 1,622 1,670 1,541    
Provision for loan losses                         (296) (124) 157    
Charge-offs                         (3) (82)    
Recoveries                         75 79 54    
Ending balance 1,401       1,622       1,670       1,401 1,622 1,670    
Individually evaluated for impairment                               44
Collectively evaluated for impairment                               1,357 1,622
Acquired with deteriorated credit quality 1,401     1,622 1,622     1,670 1,670     1,541 1,622 1,622 1,670 1,401 1,622
Individually evaluated for impairment                               466 401
Collectively evaluated for impairment                               107,158 99,891
Ending balance                               107,672 100,340
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                               48 48
Commercial Portfolio Segment [Member]                                  
Beginning balance       291       198       261 291 198 261    
Provision for loan losses                         218 226 187    
Charge-offs                         (51) (140) (264)    
Recoveries                         1 7 14    
Ending balance 459       291       198       459 291 198    
Individually evaluated for impairment                               1 4
Collectively evaluated for impairment                               458 287
Acquired with deteriorated credit quality 459     291 291     198 198     261 291 291 198 459 291
Individually evaluated for impairment                               427 42
Collectively evaluated for impairment                               35,990 34,161
Ending balance                               36,417 34,203
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                              
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]                                  
Beginning balance       710       683       626 710 683 626    
Provision for loan losses                         (278) 28 79    
Charge-offs                         (21) (6) (36)    
Recoveries                         32 5 14    
Ending balance 443       710       683       443 710 683    
Individually evaluated for impairment                               13
Collectively evaluated for impairment                               443 697
Acquired with deteriorated credit quality 443     710 710     683 683     626 710 710 683 443 710
Individually evaluated for impairment                               35 73
Collectively evaluated for impairment                               52,968 50,905
Ending balance                               53,003 50,978
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                              
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]                                  
Beginning balance       414       319         414 319      
Provision for loan losses                         793 663      
Charge-offs                         (697) (713)      
Recoveries                         173 145      
Ending balance 683       414       319       683 414 319    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               683 414
Acquired with deteriorated credit quality 683     414 414     319 319       414 414 319 683 414
Individually evaluated for impairment                              
Collectively evaluated for impairment                               57,558 52,793
Ending balance                               57,558 52,793
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]                                  
Beginning balance                              
Ending balance                          
Acquired with deteriorated credit quality                    
Ending balance                              
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]                                  
Beginning balance               319       256   319 256    
Provision for loan losses                             368    
Charge-offs                             (409)    
Recoveries                             104    
Ending balance                 319           319    
Acquired with deteriorated credit quality               $ 319 $ 319     $ 256   $ 319 $ 256    
Ending balance                               $ 57,558 $ 52,793