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Note 5 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
 3 Months Ended 12 Months Ended
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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Beginning balance       $ 3,386,000       $ 3,415,000       $ 4,846,000 $ 3,386,000 $ 3,415,000 $ 4,846,000    
Provision for loan losses $ 298,000 $ 150,000 $ 256,000 211,000 $ 220,000 $ 200,000 $ 150,000 75,000 $ 50,000 915,000 645,000 50,000    
Charge-offs                         (936,000) (918,000) (1,679,000)    
Recoveries                         269,000 244,000 198,000    
Ending balance 3,634,000       3,386,000       3,415,000       3,634,000 3,386,000 3,415,000    
Individually evaluated for impairment                               $ 52,000 $ 85,000
Collectively evaluated for impairment                               3,580,000 3,301,000
Allowance for loan losses 3,634,000     3,386,000 3,386,000     3,415,000 3,415,000     4,846,000 3,634,000 3,386,000 3,415,000 3,634,000 3,386,000
Individually evaluated for impairment                               3,423,000 3,707,000
Collectively evaluated for impairment                               410,796,000 381,427,000
Loans                               414,617,000 385,764,000
Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance 2,000                     2,000      
Allowance for loan losses 2,000                   2,000   2,000
Loans                               398,000 630,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]                                  
Beginning balance       380,000       527,000       609,000 380,000 527,000 609,000    
Provision for loan losses                         (120,000) (87,000) 35,000    
Charge-offs                         (74,000) (118,000) (128,000)    
Recoveries                         33,000 58,000 11,000    
Ending balance 219,000       380,000       527,000       219,000 380,000 527,000    
Individually evaluated for impairment                               35,000 23,000
Collectively evaluated for impairment                               182,000 357,000
Allowance for loan losses 219,000     380,000 380,000     527,000 527,000     609,000 380,000 380,000 527,000 219,000 380,000
Individually evaluated for impairment                               2,907,000 2,083,000
Collectively evaluated for impairment                               133,703,000 135,904,000
Loans                               136,960,000 138,377,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance 2,000                     2,000      
Allowance for loan losses 2,000                   2,000   2,000
Loans                               350,000 390,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]                                  
Beginning balance       56,000       157,000       201,000 56,000 157,000 201,000    
Provision for loan losses                         77,000 (92,000) (44,000)    
Charge-offs                         (9,000)    
Recoveries                            
Ending balance 133,000       56,000       157,000       133,000 56,000 157,000    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               133,000 56,000
Allowance for loan losses 133,000     56,000 56,000     157,000 157,000     201,000 56,000 56,000 157,000 133,000 56,000
Individually evaluated for impairment                              
Collectively evaluated for impairment                               18,309,000 13,951,000
Loans                               18,309,000 13,951,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans                              
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]                                  
Beginning balance       80,000       47,000       60,000 80,000 47,000 60,000    
Provision for loan losses                         165,000 33,000 (13,000)    
Charge-offs                            
Recoveries                            
Ending balance 245,000       80,000       47,000       245,000 80,000 47,000    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               245,000 80,000
Allowance for loan losses 245,000     80,000 80,000     47,000 47,000     60,000 80,000 80,000 47,000 245,000 80,000
Individually evaluated for impairment                              
Collectively evaluated for impairment                               21,034,000 19,489,000
Loans                               21,034,000 19,489,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans                              
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]                                  
Beginning balance       1,670,000       1,541,000       1,501,000 1,670,000 1,541,000 1,501,000    
Provision for loan losses                         (124,000) 157,000 6,000    
Charge-offs                         (3,000) (82,000)    
Recoveries                         79,000 54,000 34,000    
Ending balance 1,622,000       1,670,000       1,541,000       1,622,000 1,670,000 1,541,000    
Individually evaluated for impairment                              
Collectively evaluated for impairment                               1,622,000 1,670,000
Allowance for loan losses 1,622,000     1,670,000 1,670,000     1,541,000 1,541,000     1,501,000 1,670,000 1,670,000 1,541,000 1,622,000 1,670,000
Individually evaluated for impairment                               401,000 1,217,000
Collectively evaluated for impairment                               99,891,000 95,212,000
Loans                               100,340,000 96,669,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans                               48,000 240,000
Commercial Portfolio Segment [Member]                                  
Beginning balance       198,000       261,000       1,480,000 198,000 261,000 1,480,000    
Provision for loan losses                         226,000 187,000 (23,000)    
Charge-offs                         (140,000) (264,000) (1,205,000)    
Recoveries                         7,000 14,000 9,000    
Ending balance 291,000       198,000       261,000       291,000 198,000 261,000    
Individually evaluated for impairment                               4,000 43,000
Collectively evaluated for impairment                               287,000 155,000
Allowance for loan losses 291,000     198,000 198,000     261,000 261,000     1,480,000 198,000 198,000 261,000 291,000 198,000
Individually evaluated for impairment                               42,000 143,000
Collectively evaluated for impairment                               34,161,000 23,983,000
Loans                               34,203,000 24,126,000
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans                              
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]                                  
Beginning balance       683,000       626,000       720,000 683,000 626,000 720,000    
Provision for loan losses                         28,000 79,000 (49,000)    
Charge-offs                         (6,000) (36,000) (78,000)    
Recoveries                         5,000 14,000 33,000    
Ending balance 710,000       683,000       626,000       710,000 683,000 626,000    
Individually evaluated for impairment                               13,000 13,000
Collectively evaluated for impairment                               697,000 670,000
Allowance for loan losses 710,000     683,000 683,000     626,000 626,000     720,000 683,000 683,000 626,000 710,000 683,000
Individually evaluated for impairment                               73,000 244,000
Collectively evaluated for impairment                               50,905,000 43,587,000
Loans                               50,978,000 43,831,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans                              
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]                                  
Beginning balance       319,000       256,000       275,000 319,000 256,000 275,000    
Provision for loan losses                         663,000 368,000 138,000    
Charge-offs                         (713,000) (409,000) (268,000)    
Recoveries                         145,000 104,000 111,000    
Ending balance 414,000       319,000       256,000       414,000 319,000 256,000    
Individually evaluated for impairment                               6,000
Collectively evaluated for impairment                               414,000 313,000
Allowance for loan losses 414,000     319,000 319,000     $ 256,000 $ 256,000     $ 275,000 319,000 319,000 $ 256,000 414,000 319,000
Individually evaluated for impairment                               20,000
Collectively evaluated for impairment                               52,793,000 49,301,000
Loans                               52,793,000 49,321,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                                  
Beginning balance                              
Ending balance                          
Allowance for loan losses                    
Loans