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Note 4 - Recorded Investment in Loans by Risk Category (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]    
Recorded investment in loans $ 134,210,000 $ 140,438,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]    
Recorded investment in loans 1,368,000 3,657,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]    
Recorded investment in loans 1,359,000 1,948,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]    
Recorded investment in loans 2,108,000 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 139,045,000 148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]    
Recorded investment in loans 12,445,000 10,077,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]    
Recorded investment in loans 121,000 125,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]    
Recorded investment in loans 72,000 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 12,638,000 13,038,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]    
Recorded investment in loans 10,120,000 12,286,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]    
Recorded investment in loans 408,000 330,000
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 10,528,000 12,616,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]    
Recorded investment in loans 81,437,000 76,389,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]    
Recorded investment in loans 4,325,000 4,446,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]    
Recorded investment in loans 5,079,000 1,195,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]    
Recorded investment in loans 2,906,000 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 93,747,000 84,728,000
Commercial Portfolio Segment [Member] | Pass [Member]    
Recorded investment in loans 22,376,000 22,365,000
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Recorded investment in loans 810,000 471,000
Commercial Portfolio Segment [Member] | Substandard [Member]    
Recorded investment in loans 0 150,000
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Recorded investment in loans 63,000 167,000
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 23,249,000 23,153,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]    
Recorded investment in loans 41,557,000 38,956,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Special Mention [Member]    
Recorded investment in loans 159,000 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Substandard [Member]    
Recorded investment in loans 15,000 105,000
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 41,775,000 39,177,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]    
Recorded investment in loans 45,525,000 42,553,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]    
Recorded investment in loans 49,000 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 45,604,000 42,655,000
Pass [Member]    
Recorded investment in loans 347,670,000 343,064,000
Special Mention [Member]    
Recorded investment in loans 7,240,000 9,082,000
Substandard [Member]    
Recorded investment in loans 6,525,000 6,259,000
Doubtful [Member]    
Recorded investment in loans 5,151,000 5,537,000
Unlikely to be Collected Financing Receivable [Member]    
Recorded investment in loans 0 0
Recorded investment in loans $ 366,586,000 $ 363,942,000