Share-Based Payments: (Details Narrative) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | |
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Payment Arrangement, Expense | $ 710,000 | $ 2,160,000 | | $ 620,000 | $ 1,810,000 | |
Employee Benefits and Share-based Compensation | 480,000 | $ 1,420,000 | | $ 430,000 | $ 1,290,000 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | | 2 years 8 months 1 day | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | | 1 year 11 months 15 days | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 13,500,000 | $ 13,500,000 | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | 9,400,000 | 9,400,000 | | | | |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 3,300,000 | $ 3,300,000 | | | | |
Interparfums S A Subsidiary [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 173,141 | 173,141 | | | | |
[custom:RevaluationResultedInReductionOfCostDescription] | | The original cost of the grant was approximately $4.4 million, and the modification resulted in a revised cost of approximately $4.7 million | | | | |
Share-based Payment Arrangement, Expensed and Capitalized, Amount | | $ 4,400,000 | | | | |
Share-based Payment Arrangement, Plan Modification, Incremental Cost | | 4,700,000 | | | | |
Interparfums S A Subsidiary [Member] | Employees [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | 26,600 |
Interparfums S A Subsidiary [Member] | Officers And Managers [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | 133,000 |
Equity Option [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | | $ 90,000 | $ 90,000 | | | |
Equity Option [Member] | Minimum [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | 4 years | | | | |
Equity Option [Member] | Maximum [Member] | | | | | | |
Subsidiary or Equity Method Investee [Line Items] | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | 5 years | | | | |