Note 17 - Fair Value Measurements and Fair Values of Financial Instruments (Details) - Financial and Off-balance Sheet Instruments (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financial assets
Cash and cash equivalents	$ 18,245,000	$ 16,286,000	$ 15,453,000
Cash and cash equivalents	18,245,000	16,286,000
Investment securities:
Trading	4,207,000us-gaap_TradingSecurities	0us-gaap_TradingSecurities
Investment securities available-for-sale	375,219,000us-gaap_AvailableForSaleSecurities	388,670,000us-gaap_AvailableForSaleSecurities
Held-to-maturity	146,000us-gaap_HeldToMaturitySecurities	146,000us-gaap_HeldToMaturitySecurities
Held-to-maturity	156,000	162,000
Restricted investment in bank stocks	647,000us-gaap_RestrictedInvestments	1,764,000us-gaap_RestrictedInvestments
Loans held-for-sale	380,000us-gaap_LoansHeldForSaleMortgages
Loans held-for-sale	394,000
Net loans	547,281,000	492,791,000
Net loans	544,126,000	491,635,000
Mortgage servicing rights	504,000us-gaap_ServicingAsset	519,000us-gaap_ServicingAsset
Mortgage servicing rights	601,000us-gaap_ServicingAssetAtFairValueAmount	643,000us-gaap_ServicingAssetAtFairValueAmount
Accrued interest receivable	2,568,000us-gaap_InterestReceivable	2,579,000us-gaap_InterestReceivable
Accrued interest receivable	2,568,000us-gaap_InterestReceivable	2,579,000us-gaap_InterestReceivable
Financial liabilities
Deposits with no stated maturities	851,592,000us-gaap_Deposits	814,532,000us-gaap_Deposits
Short-term borrowings	35,189,000	35,156,000
Short-term borrowings	35,189,000us-gaap_ShorttermDebtFairValue	35,156,000us-gaap_ShorttermDebtFairValue
Long-term debt		5,000,000us-gaap_LongTermDebt
Long-term debt		5,056,000us-gaap_LongTermDebtFairValue
Accrued interest payable	344,000	392,000
Accrued interest payable	344,000	392,000
With No Stated Maturities [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial liabilities
Deposits with no stated maturities	608,345,000	574,987,000
With No Stated Maturities [Member]
Financial liabilities
Deposits with no stated maturities	608,345,000	574,987,000
Deposits with no stated maturities	608,345,000	574,987,000
With Stated Maturities [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial liabilities
Deposits with no stated maturities	244,152,000	241,959,000
With Stated Maturities [Member]
Financial liabilities
Deposits with no stated maturities	243,247,000	239,545,000
Deposits with no stated maturities	244,152,000	241,959,000
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and cash equivalents	18,245,000	16,286,000
Investment securities:
Investment securities available-for-sale	7,655,000	6,625,000
Financial liabilities
Short-term borrowings	35,189,000	35,156,000
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Trading	4,207,000
Investment securities available-for-sale	365,125,000	379,976,000
Held-to-maturity	156,000	162,000
Restricted investment in bank stocks	647,000	1,764,000
Loans held-for-sale	394,000
Accrued interest receivable	2,568,000	2,579,000
Accrued interest receivable	2,568,000	2,579,000
Financial liabilities
Long-term debt		5,056,000
Accrued interest payable	344,000	392,000
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Investment securities available-for-sale	2,439,000	2,069,000
Net loans	544,126,000	491,635,000
Mortgage servicing rights	$ 601,000	$ 643,000

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Fair value portion of accrued expenses.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Amount classified as mortgage loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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