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Investments in Securities and Fair Value Schedule of Carrying Value and Fair Value of Financial Assets (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Assets        
Cash and cash equivalents, carrying value $ 15,826,515us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,626,761us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,810,018us-gaap_CashAndCashEquivalentsAtCarryingValue $ 18,042,258us-gaap_CashAndCashEquivalentsAtCarryingValue
Cost-basis investments, carrying value 2,516,608us-gaap_CostMethodInvestments 1,927,429us-gaap_CostMethodInvestments    
Accrued dividends and interest, carrying value 1,063,837itic_AccruedDividendsAndInterestCarryingValue 1,006,698itic_AccruedDividendsAndInterestCarryingValue    
Financial assets disclosed, carrying value 19,406,960itic_FinancialAssetsDisclosedCarryingValue 26,560,888itic_FinancialAssetsDisclosedCarryingValue    
Cash and cash equivalents, estimated fair value 15,826,515us-gaap_CashAndCashEquivalentsFairValueDisclosure 23,626,761us-gaap_CashAndCashEquivalentsFairValueDisclosure    
Cost-basis investments, estimated fair value 2,675,817us-gaap_CostMethodInvestmentsFairValueDisclosure 2,069,302us-gaap_CostMethodInvestmentsFairValueDisclosure    
Accrued dividends and interest, estimated fair value 1,063,837itic_AccruedDividendsAndInterestEstimatedFairValue 1,006,698itic_AccruedDividendsAndInterestEstimatedFairValue    
Financial assets disclosed, estimated fair value 19,566,169us-gaap_AssetsFairValueDisclosureRecurring 26,702,761us-gaap_AssetsFairValueDisclosureRecurring    
Financial Liabilities        
Contingent consideration, carrying value   341,250itic_BusinessAcquisitionContingentConsiderationAtCarryingValue    
Financial liabilities, carrying value   341,250itic_FinancialLiabilitiesCarryingValue    
Business Combination, Contingent Consideration, Liability   341,250us-gaap_BusinessCombinationContingentConsiderationLiability    
Financial liabilities, estimated fair value   341,250us-gaap_LiabilitiesFairValueDisclosureRecurring    
Level 1        
Financial Assets        
Cash and cash equivalents, estimated fair value 15,826,515us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
23,626,761us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Cost-basis investments, estimated fair value 0us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Accrued dividends and interest, estimated fair value 1,063,837itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
1,006,698itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial assets disclosed, estimated fair value 16,890,352us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
24,633,459us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial Liabilities        
Business Combination, Contingent Consideration, Liability   0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities, estimated fair value   0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Level 2        
Financial Assets        
Cash and cash equivalents, estimated fair value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Cost-basis investments, estimated fair value 0us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Accrued dividends and interest, estimated fair value 0itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial assets disclosed, estimated fair value 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial Liabilities        
Business Combination, Contingent Consideration, Liability   0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities, estimated fair value   0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Level 3        
Financial Assets        
Cash and cash equivalents, estimated fair value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Cost-basis investments, estimated fair value 2,675,817us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
2,069,302us-gaap_CostMethodInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Accrued dividends and interest, estimated fair value 0itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0itic_AccruedDividendsAndInterestEstimatedFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial assets disclosed, estimated fair value 2,675,817us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
2,069,302us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial Liabilities        
Business Combination, Contingent Consideration, Liability   341,250us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Financial liabilities, estimated fair value   $ 341,250us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member