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STOCKHOLDERS' EQUITY (Details) (USD $)
0 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Apr. 03, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2012
Jun. 30, 2014
Dec. 31, 2014
Sep. 30, 2013
Mar. 31, 2014
Common Stock [Abstract]                    
Shares sold in underwritten public offering (in shares) 1,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues                  
Price per share of common stock sold in the offering (in dollars per share) $ 5.00us-gaap_SharePrice                  
Proceeds from sale of offering $ 5,408,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock $ 5,408,462us-gaap_ProceedsFromIssuanceOfCommonStock              
Number of stock options exercised (in shares)   318,750us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 88,551us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised              
Exercise prices of stock option, minimum (in dollars per share)   $ 1.04us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit $ 1.04us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit              
Exercise prices of stock option, maximum (in dollars per share)   $ 1.04us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit $ 1.76us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit              
Preferred Stock [Abstract]                    
Preferred stock - shares authorized (in shares)   10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized         10,000,000us-gaap_PreferredStockSharesAuthorized    
Preferred stock - shares outstanding (in shares)   0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding         0us-gaap_PreferredStockSharesOutstanding    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Reduced attributable expense   $ 447,100us-gaap_ShareBasedCompensation $ 331,870us-gaap_ShareBasedCompensation              
Warrants [Abstract]                    
Warrants outstanding (in shares)   0us-gaap_ClassOfWarrantOrRightOutstanding 0us-gaap_ClassOfWarrantOrRightOutstanding         0us-gaap_ClassOfWarrantOrRightOutstanding    
Exercise price of warrants (in dollars per share)                     
Executives [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)       16,360us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
           
Exercise price of stock option (in dollars per share)       $ 5.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
           
Expiration period of stock option       5 years            
Newly Hired Vice Presidents [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
         
Number of equal annual installments with in which options are exercisable           0cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
       
BOD [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)             46,875us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_BODMember
     
Exercise price of stock option (in dollars per share)             $ 3.480us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_BODMember
     
Expiration period of stock option             5 years      
Number of equal annual installments with in which options are exercisable             5cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= cemi_BODMember
     
New Vice Presidents [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_NewVicePresidentsMember
         
Exercise price of stock option (in dollars per share)         0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_NewVicePresidentsMember
         
Other New Vice President [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)         36,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_OtherNewVicePresidentMember
         
Exercise price of stock option (in dollars per share)         4.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_OtherNewVicePresidentMember
         
Expiration period of stock option         5 years          
Number of equal annual installments with in which options are exercisable               3cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= cemi_OtherNewVicePresidentMember
   
EVP [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)       30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_EvpMember
           
Exercise price of stock option (in dollars per share)       $ 5.44us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_EvpMember
           
Number of equal annual installments with in which options are exercisable       3cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= cemi_EvpMember
           
COO [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)                 5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_CooMember
 
Exercise price of stock option (in dollars per share)                 $ 4.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_CooMember
 
Number of equal annual installments with in which options are exercisable                 2cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= cemi_CooMember
 
CEO [Member]                    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                    
Stock options issued to purchase of common stock (in shares)                   250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_TitleOfIndividualAxis
= cemi_CEOMember
Exercise price of stock option (in dollars per share)                   $ 3.416us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= cemi_CEOMember
Expiration period of stock option                   7 years
Number of equal annual installments with in which options are exercisable                   5cemi_NumberOfEqualAnnualInstallmentsWithInWhichOptionsAreExercisable
/ us-gaap_TitleOfIndividualAxis
= cemi_CEOMember