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SHORT-TERM BORROWINGS (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Jul. 25, 2014
Jul. 16, 2014
Mar. 24, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]          
Beginning balance interest         $ 0us-gaap_InterestPayableCurrent
Ending balance interest 96,108us-gaap_InterestPayableCurrent       0us-gaap_InterestPayableCurrent
Short-term Debt [Member]          
Line of Credit Facility [Line Items]          
Beginning balance principal 0us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Beginning balance interest 0us-gaap_InterestPayableCurrent
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Principal advances 700,000ztho_DebtInstrumentAdvancePrincipalPayments
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Accrued interest 94,924us-gaap_DebtInstrumentIncreaseAccruedInterest
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Principal payments (111,789)us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Interest (92,408)us-gaap_DebtInstrumentPeriodicPaymentInterest
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Ending balance principal 588,211us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Ending balance interest 2,516us-gaap_InterestPayableCurrent
/ us-gaap_ExtinguishmentOfDebtAxis
= us-gaap_ShortTermDebtMember
       
Line of Credit facility [Member]          
Line of Credit Facility [Line Items]          
Revolving loan amount to the company   668,750us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
582,842us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Monthly periodic payment   12,143us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
12,143us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
10,417us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Fixed rate of interest (in hundredths)   22.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
22.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
20.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Interest rate in case of default (in hundredths)       25.00%ztho_LineOfCreditFacilityInterestRateInCaseOfDefault
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Successive monthly installments payment   $ 13,679ztho_SuccessiveMonthlyInstallmentsPayment
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember