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Shareholders' Equity, Stock Plans and Preferred Stock (Shareholders' Equity and Stock Plans) (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation $ 580us-gaap_AllocatedShareBasedCompensationExpense $ 950us-gaap_AllocatedShareBasedCompensationExpense $ 573us-gaap_AllocatedShareBasedCompensationExpense
Total unrecognized stock-based compensation expense $ 251us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Stock Options and Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining life of outstanding equity grants (years) 4 years 9 months 11 days    
Weighted average remaining life of grants that are exercisable (years) 4 years 7 months 17 days    
Stock option and SOSAR grants exercised 25,000avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsExercisesInPeriod
/ us-gaap_AwardTypeAxis
= avca_StockOptionsAndStockAppreciationRightsSarsMember
   
Stock Only Stock Appreciation Rights (SOSARS) | Ratably over 3 Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage of awards 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_VestingAxis
= avca_RatablyOverThreeYearsMember
   
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants approved by the Board of Directors (shares) 68,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
68,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock | Ratably over 3 Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage of awards 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_VestingAxis
= avca_RatablyOverThreeYearsMember
   
2005 Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (shares) 700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= avca_TwoThousandAndFiveLongTermIncentivePlanMember
   
Maximum term of option (years) 10 years    
2008 Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (shares) 150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= avca_TwoThousandAndEightStockPurchasePlanMember
   
Percentage of fair market value at date of grant (percentage) 85.00%avca_ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketPriceOfferingDate
/ us-gaap_PlanNameAxis
= avca_TwoThousandAndEightStockPurchasePlanMember
   
Restriction period 2 years    
2010 Long Term Incentive Plan | Stock Only Stock Appreciation Rights (SOSARS)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (shares) 380,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= avca_TwoThousandAndTenLongTermIncentivePlanMember