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Note 4 - Major Customers (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Major Customers (Details) [Line Items]    
Number of Operating Segments 3us-gaap_NumberOfOperatingSegments  
Texas Instruments Incorporated [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Note 4 - Major Customers (Details) [Line Items]    
Concentration Risk, Percentage 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intt_TexasInstrumentsIncorporatedMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intt_TexasInstrumentsIncorporatedMember
Hakuto Co., Ltd. [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Note 4 - Major Customers (Details) [Line Items]    
Concentration Risk, Percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intt_HakutoCoLtdMember