Note 5 - Loans and Allowance for Loan Losses (Details)		12 Months Ended
Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 506,000	$ 583,000	$ 506,000
Loans and Leases Receivable, Gross	306,485,000	363,942,000	306,485,000
Loans and Leases Receivable, Related Parties, Additions		7,790,000
Loans and Leases Receivable, Related Parties	8,609,000	$ 8,175,000	$ 8,609,000
Financing Receivable, Allowance for Credit Losses, Loss Factor Increase		0.25%
Financing Receivable, Allowance for Credit Losses, Loss Factor		20.00%
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	$ 1,600,000	$ 1,400,000
Financing Receivable Allowance For Credit Losses Risk Factor	1.18	1.18	1.18
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0	$ 0	$ 0
Troubled Debt Restructurings Principal Charge-offs			0
Troubled Debt Restructurings Specific Allowance			0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 187,000	0
Impaired Financing Receivable, Interest Income, Cash Basis Method		0	0
Financing Receivable, Allowance for Credit Losses, Write-downs		1,679,000	620,000
Classified Loans [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)		$ 410,000	$ 664,000
Qualitative Factor Economic Condition [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Allowance For Credit Losses Risk Factor	1.20	1.20	1.20
Qualitative Factor Past Due Loans [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Allowance For Credit Losses Risk Factor	1.20	1.20	1.20
Qualitative Factor Other Internal And External Factors [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Allowance For Credit Losses Risk Factor	1.30	1.30	1.30
Overall Qualitative Factor [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Allowance For Credit Losses Risk Factor	1.18	1.18	1.18
Allowance for Loan and Lease Losses, Period Increase (Decrease)		$ 457,000	$ 520,000
Residential Mortgage Segment [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loan To Value Ratio		90.00%
Loans and Leases Receivable, Gross		$ 2,500,000
Amount of Loans Serviced for Others	$ 169,000	156,000	169,000
Purchased Credit Impaired Loans [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Credit Losses, Change in Method of Calculating Impairment	0	0	0
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0
Director of the Bank [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Related Parties, Additions		862,000
Loans and Leases Receivable, Related Parties	$ 1,200,000	1,300,000	$ 1,200,000
Peoples Bancorp, Inc. [Member]
Note 5 - Loans and Allowance for Loan Losses (Details) [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums		$ 590,000

The amount of mortgage loans serviced for the benefit of others.

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Amount of loss factor related to financing receivables.

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Ratio of the appraised value of a property to its mortgage.

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Principal charge-offs recorded as TDRs.

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Specific allowance for loan losses related to TDRs modified.

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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.

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

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The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of direct write-downs of financing receivables charged against the allowance.

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-Name Accounting Standards Codification
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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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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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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 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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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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