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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
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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 |  |

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