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Note 8 - Internal Risk Ratings and Payment Activity (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]    
Loans and leases receivable $ 107,242,000 $ 117,246,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]    
Loans and leases receivable 4,000 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]    
Loans and leases receivable 7,648,000 7,151,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Loans and leases receivable 114,894,000 124,397,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]    
Loans and leases receivable 33,514,000 27,355,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]    
Loans and leases receivable 0 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]    
Loans and leases receivable 13,000 17,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Commercial Portfolio Segment [Member] | Construction Loans [Member]    
Loans and leases receivable 33,527,000 27,372,000
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Pass [Member]    
Loans and leases receivable 212,632,000 218,958,000
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Special Mention [Member]    
Loans and leases receivable 808,000 361,000
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Substandard [Member]    
Loans and leases receivable 11,714,000 15,852,000
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]    
Loans and leases receivable 225,154,000 235,171,000
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Pass [Member]    
Loans and leases receivable 60,725,000 60,286,000
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Special Mention [Member]    
Loans and leases receivable 0 34,000
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Substandard [Member]    
Loans and leases receivable 2,764,000 2,844,000
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]    
Loans and leases receivable 63,489,000 63,164,000
State and Political Subdivisions Portfolio Segment [Member] | Pass [Member]    
Loans and leases receivable 39,624,000 39,027,000
State and Political Subdivisions Portfolio Segment [Member] | Special Mention [Member]    
Loans and leases receivable 0 0
State and Political Subdivisions Portfolio Segment [Member] | Substandard [Member]    
Loans and leases receivable 1,220,000 1,258,000
State and Political Subdivisions Portfolio Segment [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
State and Political Subdivisions Portfolio Segment [Member]    
Loans and leases receivable 40,844,000 40,285,000
Finance Leases Portfolio Segment [Member] | Pass [Member]    
Loans and leases receivable 9,450,000 10,168,000
Finance Leases Portfolio Segment [Member] | Special Mention [Member]    
Loans and leases receivable 0 0
Finance Leases Portfolio Segment [Member] | Substandard [Member]    
Loans and leases receivable 117,000 203,000
Finance Leases Portfolio Segment [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Finance Leases Portfolio Segment [Member]    
Loans and leases receivable 9,567,000 10,371,000
Excluding Retail Loans [Member] | Pass [Member]    
Loans and leases receivable 463,187,000 473,040,000
Excluding Retail Loans [Member] | Special Mention [Member]    
Loans and leases receivable 812,000 395,000
Excluding Retail Loans [Member] | Substandard [Member]    
Loans and leases receivable 23,476,000 27,325,000
Excluding Retail Loans [Member] | Doubtful [Member]    
Loans and leases receivable 0 0
Excluding Retail Loans [Member]    
Loans and leases receivable 487,475,000 500,760,000
Loans and leases receivable $ 604,409,000 $ 615,263,000