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Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio	Dec. 31, 2014	Dec. 31, 2013
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items]
Loan portfolio	100.00%ovbc_PercentageOfLoanPortfolio	100.00%ovbc_PercentageOfLoanPortfolio
Residential Portfolio Segment [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items]
Loan portfolio	37.60%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	38.73%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items]
Loan portfolio	29.86%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	32.47%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Consumer Portfolio Segment [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items]
Loan portfolio	18.42%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	18.06%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Commercial and Industrial [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Composition of Loan Portfolio [Line Items]
Loan portfolio	14.12%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember	10.74%ovbc_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ovbc_CommercialAndIndustrialMember

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