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Note 5 - Loans and Related Allowance for Loan and Lease Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Loans $ 992,109 $ 923,213
Commercial And Industrial [Member]    
Loans 83,857 101,346
Real Estate Construction Porfolio Segment [Member]    
Loans 56,731 47,017
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 336,487 318,157
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
Loans 498,247 437,947
Consumer Portfolio Segment [Member]    
Loans 16,787 18,746
Pass [Member]    
Loans 965,166 897,759
Pass [Member] | Commercial And Industrial [Member]    
Loans 77,002 95,621
Pass [Member] | Real Estate Construction Porfolio Segment [Member]    
Loans 55,397 46,995
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 332,475 312,176
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
Loans 483,516 424,225
Pass [Member] | Consumer Portfolio Segment [Member]    
Loans 16,776 18,742
Special Mention [Member]    
Loans 13,076 11,829
Special Mention [Member] | Commercial And Industrial [Member]    
Loans 4,572 1,942
Special Mention [Member] | Real Estate Construction Porfolio Segment [Member]    
Loans 1,334
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 553 723
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
Loans 6,617 9,164
Substandard [Member]    
Loans 13,867 13,625
Substandard [Member] | Commercial And Industrial [Member]    
Loans 2,283 3,783
Substandard [Member] | Real Estate Construction Porfolio Segment [Member]    
Loans 22
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans 3,459 5,258
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
Loans 8,114 4,558
Substandard [Member] | Consumer Portfolio Segment [Member]    
Loans 11 $ 4
Doubtful [Member]    
Loans  
Doubtful [Member] | Commercial And Industrial [Member]    
Loans  
Doubtful [Member] | Real Estate Construction Porfolio Segment [Member]    
Loans  
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans  
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
Loans