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Note 16 - Employee Benefits and Retirement Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percentage of Deferred Salary 100.00%boch_DefinedContributionPlanEmployerMatchingContributionPercentageOfDeferredSalary    
Defined Contribution Plan, Maximum Annual Employee Contribution, Percentage of Deferred Salary 3.00%boch_DefinedContributionPlanMaximumAnnualEmployeeContributionPercentageOfDeferredSalary    
Defined Contribution Plan, Employer Matching Contribution, Percentage of Deferred Salary One 50.00%boch_DefinedContributionPlanEmployerMatchingContributionPercentageOfDeferredSalaryOne    
Defined Contribution Plan, Maximum Annual Employee Contribution, Percentage of Deferred Salary One 2.00%boch_DefinedContributionPlanMaximumAnnualEmployeeContributionPercentageOfDeferredSalaryOne    
Defined Contribution Plan, Cost Recognized $ 368,000us-gaap_DefinedContributionPlanCostRecognized $ 317,000us-gaap_DefinedContributionPlanCostRecognized  
Defined Benefit Plan, Contributions by Employer     308,000us-gaap_DefinedBenefitPlanContributionsByEmployer
Interest Accrued Rate 2.00%boch_InterestAccruedRate    
Deferred Compensation Period 30 days    
Deferred Compensation Arrangement with Individual, Compensation Expense 458,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 179,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 594,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Minimum [Member]      
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Defined Benefit Plan, Designated Payment Period 10 years    
Maximum [Member]      
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Defined Benefit Plan, Designated Payment Period 20 years    
Executive Officer [Member]      
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Defined Contribution Plan, Number of Employees Covered 2us-gaap_DefinedContributionPlanNumberOfEmployeesCovered
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		    
Deferred Compensation Arrangement With Individual Compensation Deferral Period 15 years    
Deferred Compensation Arrangement With Individual, Compensation Interest Rate 10.00%boch_DeferredCompensationArrangementWithIndividualCompensationInterestRate
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		    
Deferred Compensation Arrangement with Individual, Recorded Liability 125,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		 213,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		 383,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Director [Member]      
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Deferred Compensation Arrangement With Individual, Compensation Interest Rate 10.00%boch_DeferredCompensationArrangementWithIndividualCompensationInterestRate
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		    
Deferred Compensation Arrangement with Individual, Recorded Liability 3,600,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 3,400,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 3,200,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Defined Benefit Plan, Basis Spread on Variable Rate 3.25%boch_DefinedBenefitPlanBasisSpreadOnVariableRate
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		    
Deferred Compensation Arrangement with Individual, Compensation Expense 458,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 179,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 594,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Supplemental Employee Retirement Plan [Member]      
Note 16 - Employee Benefits and Retirement Plans (Details) [Line Items]      
Defined Benefit Plan, Compensation Expense 555,000boch_DefinedBenefitPlanCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 198,000boch_DefinedBenefitPlanCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 349,000boch_DefinedBenefitPlanCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Defined Benefit Plan, Benefit Obligation $ 3,300,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 $ 3,000,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 $ 3,100,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember