Note 4 - Recorded Investment in Loans by Risk Category (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]
Recorded investment in loans	$ 139,910,000	$ 140,438,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]
Recorded investment in loans	1,399,000	3,657,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]
Recorded investment in loans	1,656,000	1,948,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]
Recorded investment in loans	1,911,000	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	144,876,000	148,575,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]
Recorded investment in loans	10,336,000	10,077,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]
Recorded investment in loans	124,000	125,000
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]
Recorded investment in loans	2,719,000	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	13,179,000	13,038,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Recorded investment in loans	10,300,000	12,286,000
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Recorded investment in loans	164,000	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	10,464,000	12,616,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]
Recorded investment in loans	76,730,000	76,389,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]
Recorded investment in loans	7,157,000	4,446,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]
Recorded investment in loans	701,000	1,195,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]
Recorded investment in loans	2,375,000	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	86,963,000	84,728,000
Commercial Portfolio Segment [Member] | Pass [Member]
Recorded investment in loans	23,870,000	22,365,000
Commercial Portfolio Segment [Member] | Special Mention [Member]
Recorded investment in loans	618,000	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	163,000	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	24,651,000	23,153,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]
Recorded investment in loans	38,509,000	38,956,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Special Mention [Member]
Recorded investment in loans	0	0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Substandard [Member]
Recorded investment in loans	0	105,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Doubtful [Member]
Recorded investment in loans	46,000	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	38,555,000	39,177,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]
Recorded investment in loans	43,414,000	42,553,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]
Recorded investment in loans	46,000	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	48,000	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	43,508,000	42,655,000
Pass [Member]
Recorded investment in loans	343,069,000	343,064,000
Special Mention [Member]
Recorded investment in loans	9,508,000	9,082,000
Substandard [Member]
Recorded investment in loans	5,076,000	6,259,000
Doubtful [Member]
Recorded investment in loans	4,543,000	5,537,000
Unlikely to be Collected Financing Receivable [Member]
Recorded investment in loans	0	0
Recorded investment in loans	$ 362,196,000	$ 363,942,000