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5A. INCOME TAXES (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Current tax expense        
US Federal     $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State and local     0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign     7,080us-gaap_CurrentForeignTaxExpenseBenefit 3,944us-gaap_CurrentForeignTaxExpenseBenefit
Total current tax expense     7,080us-gaap_CurrentIncomeTaxExpenseBenefit 3,944us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit)        
US Federal     0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local     0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign     0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred tax expense (benefit)     0us-gaap_DeferredIncomeTaxesAndTaxCredits 0us-gaap_DeferredIncomeTaxesAndTaxCredits
Total tax expense        
US federal     0ZMTP_UsFederalTotalTaxExpenseBenefit 0ZMTP_UsFederalTotalTaxExpenseBenefit
State and local     0ZMTP_StateAndLocalTotalTaxExpenseBenefit 0ZMTP_StateAndLocalTotalTaxExpenseBenefit
Foreign     7,080ZMTP_ForeignTotalTaxExpenseBenefit 3,944ZMTP_ForeignTotalTaxExpenseBenefit
Total $ 0us-gaap_IncomeTaxExpenseBenefit $ 1,331us-gaap_IncomeTaxExpenseBenefit $ 7,080us-gaap_IncomeTaxExpenseBenefit $ 3,944us-gaap_IncomeTaxExpenseBenefit