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12. Retirement Plan (Details Narrative) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Retirement Plan Details Narrative |  |
Company matching contributions charged to expense | $ 4,682 | $ 4,779

X
- References No definition available. + Details
Name: | ZMTP_RetirementPlanDetailsNarrativeAbstract
Namespace Prefix: | ZMTP_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration