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STOCK-BASED COMPENSATION (Details Textual) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Options Plan [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 654,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 382,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   539,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 317,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross   11,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 9,950us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 15,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value   $ 27.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue    
Restricted Stock [Member]        
Stock Options Plan [Line Items]        
Allocated Share-based Compensation Expense   88,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
62,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
41,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options   168,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   24 months 12 days    
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross 3,950us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Value 97,000cmoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Non Restricted Stock Option [Member]        
Stock Options Plan [Line Items]        
Allocated Share-based Compensation Expense   39,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
34,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
30,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options   67,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
   
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   24 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 225,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
$ 204,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
$ 178,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= cmoh_NonRestrictedStockOptionMember
Incentive Stock Option Plan 2009 [Member]        
Stock Options Plan [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cmoh_IncentiveStockOptionPlan2009Member
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   55,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= cmoh_IncentiveStockOptionPlan2009Member
   
Stock Option [Member]        
Stock Options Plan [Line Items]        
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross 11,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember