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Note 4 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due $ 2,387,000 $ 3,078,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 152,000 55,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 71,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 0 435,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 119,000 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 100,000 365,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 235,000 464,000
Financing Receivables, 30 to 59 Days Past Due [Member]    
Past Due 2,993,000 4,468,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 417,000 786,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 0 26,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 0 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 0 773,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 57,000 100,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 269,000 6,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 115,000 13,000
Financing Receivables, 60 to 89 Days Past Due [Member]    
Past Due 858,000 1,704,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 928,000 1,256,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 0 99,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 177,000 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 742,000 396,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]    
Past Due 0 67,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 13,000 80,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 30,000 9,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Past Due 1,890,000 1,907,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Past Due 3,732,000 5,120,000
Current 130,333,000 142,571,000
Purchased Credit Impaired Loans 377,000 884,000
Recorded investment in loans 134,442,000 148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Past Due 152,000 180,000
Current 13,112,000 12,858,000
Purchased Credit Impaired Loans 0 0
Recorded investment in loans 13,264,000 13,038,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Past Due 177,000 71,000
Current 15,185,000 12,545,000
Purchased Credit Impaired Loans 0 0
Recorded investment in loans 15,362,000 12,616,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Past Due 742,000 1,604,000
Current 93,026,000 82,658,000
Purchased Credit Impaired Loans 249,000 466,000
Recorded investment in loans 94,017,000 84,728,000
Commercial Portfolio Segment [Member]    
Past Due 176,000 167,000
Current 22,772,000 22,986,000
Purchased Credit Impaired Loans 0 0
Recorded investment in loans 22,948,000 23,153,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Past Due 382,000 451,000
Current 42,566,000 38,726,000
Purchased Credit Impaired Loans 0 0
Recorded investment in loans 42,948,000 39,177,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Past Due 380,000 486,000
Current 47,505,000 42,169,000
Purchased Credit Impaired Loans 0 0
Recorded investment in loans 47,885,000 42,655,000
Past Due 5,741,000 8,079,000
Current 364,499,000 354,513,000
Purchased Credit Impaired Loans 626,000 1,350,000
Recorded investment in loans $ 370,866,000 $ 363,942,000