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MAJOR CUSTOMERS AND CONCENTRATIONS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Customer
Dec. 31, 2013
Customer
Concentration Risk [Line Items]    
Deposits that exceeded the federally insured limits 777,713ztho_DepositsThatExceededFederallyInsuredLimits 193,472ztho_DepositsThatExceededFederallyInsuredLimits
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of customers above risk benchmark 3ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
3ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerOneMember
36.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerOneMember
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerTwoMember
24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerTwoMember
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer Three [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerThreeMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerThreeMember
Accounts Receivable [Member] | Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Number of customers above risk benchmark 2ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
2ztho_NumberOfCustomersAboveRiskBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerOneMember
61.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerOneMember
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]    
Concentration Risk [Line Items]    
Concentration risk (in hundredths) 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerTwoMember
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ ztho_CustomerRiskGroupAxis
= ztho_CustomerTwoMember