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Note 14 - Segment Information (Details) - Identifiable Assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Identifiable assets $ 38,738us-gaap_Assets $ 35,481us-gaap_Assets
Thermal Products [Member]    
Segment Reporting Information [Line Items]    
Identifiable assets 26,211us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ThermalProductsMember		 23,934us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ThermalProductsMember
Mechanical Products [Member]    
Segment Reporting Information [Line Items]    
Identifiable assets 7,801us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_MechanicalProductsMember		 7,093us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_MechanicalProductsMember
Electrical Products [Member]    
Segment Reporting Information [Line Items]    
Identifiable assets $ 4,726us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ElectricalProductsMember		 $ 4,454us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= intt_ElectricalProductsMember