Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Recorded investment in loans	$ 412,218,000	$ 414,617,000
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Recorded investment in loans	134,883,000	136,960,000
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Recorded investment in loans	95,651,000	100,340,000
Commercial Portfolio Segment [Member]
Recorded investment in loans	33,285,000	34,203,000
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Recorded investment in loans	50,588,000	50,978,000
Nonperforming Financial Instruments [Member]
TDR accruing	1,032,000	858,000
TDR nonaccrual	106,000	106,000
Recorded investment in loans	1,138,000	964,000
TDR related allowance for loan losses	0
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
TDR accruing	484,000	487,000
TDR nonaccrual	106,000	106,000
Recorded investment in loans	590,000	593,000
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
TDR accruing	354,000	356,000
TDR nonaccrual
Recorded investment in loans	354,000	356,000
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
TDR accruing	179,000
TDR nonaccrual
Recorded investment in loans	179,000
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] \| Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
TDR accruing	15,000	15,000
TDR nonaccrual
Recorded investment in loans	15,000	15,000
TDR related allowance for loan losses

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.

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