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Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Loans by Risk Category (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]    
Recorded investment in loans $ 131,029,000 $ 140,438,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]    
Recorded investment in loans 518,000 3,657,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]    
Recorded investment in loans 1,035,000 1,948,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]    
Recorded investment in loans 1,860,000 2,532,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Recorded investment in loans 134,442,000 148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]    
Recorded investment in loans 13,105,000 10,077,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]    
Recorded investment in loans 88,000 125,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]    
Recorded investment in loans 71,000 2,812,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Doubtful [Member]    
Recorded investment in loans 0 24,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Recorded investment in loans 13,264,000 13,038,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]    
Recorded investment in loans 15,362,000 12,286,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]    
Recorded investment in loans 0 330,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Recorded investment in loans 15,362,000 12,616,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]    
Recorded investment in loans 84,107,000 76,389,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]    
Recorded investment in loans 3,466,000 4,446,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]    
Recorded investment in loans 4,696,000 1,195,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]    
Recorded investment in loans 1,748,000 2,698,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Recorded investment in loans 94,017,000 84,728,000
Commercial Portfolio Segment [Member] | Pass [Member]    
Recorded investment in loans 22,023,000 22,365,000
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Recorded investment in loans 864,000 471,000
Commercial Portfolio Segment [Member] | Substandard [Member]    
Recorded investment in loans 0 150,000
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Recorded investment in loans 61,000 167,000
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Commercial Portfolio Segment [Member]    
Recorded investment in loans 22,948,000 23,153,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]    
Recorded investment in loans 42,703,000 38,956,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Special Mention [Member]    
Recorded investment in loans 161,000 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Substandard [Member]    
Recorded investment in loans 40,000 105,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Doubtful [Member]    
Recorded investment in loans 44,000 116,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Recorded investment in loans 42,948,000 39,177,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]    
Recorded investment in loans 47,782,000 42,553,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]    
Recorded investment in loans 73,000 53,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Substandard [Member]    
Recorded investment in loans 0 49,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Doubtful [Member]    
Recorded investment in loans 30,000 0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Recorded investment in loans 47,885,000 42,655,000
Pass [Member]    
Recorded investment in loans 356,111,000 343,064,000
Special Mention [Member]    
Recorded investment in loans 5,170,000 9,082,000
Substandard [Member]    
Recorded investment in loans 5,842,000 6,259,000
Doubtful [Member]    
Recorded investment in loans 3,743,000 5,537,000
Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Recorded investment in loans $ 370,866,000 $ 363,942,000