Note 4 - Loans and Allowance for Loan Losses (Details)	12 Months Ended
Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Payments to Acquire Loans Receivable	$ 8,283,000	$ 3,756,000	$ 131,000
Loans Receivable Acquired, Average Amount Outstanding	115,000	80,000
Loans Pledged as Collateral	440,000,000	441,000,000
Loans and Leases Receivable, Gross	959,275,000	931,944,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	1,900,000	2,200,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0	0
Financing Receivable, Modifications, Number of Contracts	3
Financing Receivable, Modifications, Recorded Investment	$ 23,831,000	$ 24,429,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
TDR Financing Receivable [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 356,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0
Purchased Loan at Discount [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Modifications, Purchase Price Discount	$ 482,000
Financing Receivable Modification Discount in Percentage	15.00%
Financing Receivable, Modifications, Recorded Investment	$ 11,200,000
Percent of Total Restructed Loans	47.20%
Directors, Executive Officers, Principal Shareholders and Immediate Family Members [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	$ 18,500,000

Represents the purchase price discount as a percentage of the purchased principal amount.

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- Definition

Represents the purchase price discount of troubled debt restructurings.

+ References

No definition available.

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- Definition

The average balance on loans receivable acquired.

+ References

No definition available.

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Represents the total outstanding balance related to a credit that was modified as troubled debt restructuring as a percentage of total restructured loans.

+ References

No definition available.

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- Definition

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

+ References

No definition available.

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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- Definition

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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-SubTopic 10
-Section 45
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Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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