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6A. SIGNIFICANT CUSTOMERS (Details Narrative)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Three customers percentage of total sales    
Percent concentration 74.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_Sales3CustomersMember
69.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_Sales3CustomersMember
One customer percentage of total sales    
Percent concentration 53.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_Sales1CustomersMember
51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_Sales1CustomersMember
Three customers percentage of total accounts receivables    
Percent concentration 92.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_AccountsReceivables3CustomersMember
84.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_AccountsReceivables3CustomersMember
One customer percentage of total accounts receivables    
Percent concentration 64.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_AccountsReceivables1CustomersMember
71.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ZMTP_AccountsReceivables1CustomersMember