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Note 4 - Loans and Related Allowance for Loan and Lease Losses - Troubled Debt Restructurings Subsequently Defaulted (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0    
Commercial And Industrial [Member]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     2 2
Recorded investment, subsequently defaulted     $ 7,000 $ 14,000
Number of contracts, subsequently defaulted $ 434,000 $ 127,000 610,000  
Real Estate Construction Porfolio Segment [Member]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts       1
Recorded investment, subsequently defaulted     $ 130,000
Number of contracts, subsequently defaulted 181,000   $ 1  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     4  
Recorded investment, subsequently defaulted     $ 278,000  
Number of contracts, subsequently defaulted 535,000 $ 256,000 $ 166,000  
Commercial Real Estate Portfolio Segment [Member]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     1  
Recorded investment, subsequently defaulted     $ 119,000  
Number of contracts, subsequently defaulted $ 270,000   $ 311,000