Recent Agreements: (Details Narrative) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€)	Sep. 30, 2024 EUR (€)	Mar. 31, 2022	Apr. 30, 2021 ft² Number
Business Acquisition [Line Items]
Purchase price, period cost			$ 156.0	€ 139
Acquisition costs, period cost			$ 3.0
Long-term debt, term	4 years		10 years		10 years		10 years
Long-term line of credit			$ 134.4		€ 120
Description of debt instrument interest rate terms			one-month Euribor plus 0.75%	one-month Euribor plus 0.75%
Debt instrument, face amount | €					€ 80
Variable interest rate			2.00%		2.00%
Fixed interest rate			1.10%		1.10%
Minimum [Member]
Business Acquisition [Line Items]
Depreciated over a range			7 years		7 years
Maximum [Member]
Business Acquisition [Line Items]
Depreciated over a range			50 years		50 years
Land [Member]
Business Acquisition [Line Items]
Purchase price, period cost			$ 64.1	€ 57
Building [Member]
Business Acquisition [Line Items]
Purchase price, period cost			$ 91.9	€ 82
Interparfums SA [Member]
Business Acquisition [Line Items]
Ownership percentage						72.00%	72.00%
Number of buildings | Number							3
Number of inner courtyards | Number							2
Area of Real Estate Property | ft²							40,000
Van Cleef and Arpels [Member]
Business Acquisition [Line Items]
Description of recent agreement			In 2006, Van Cleef & Arpels and Interparfums SA signed a 12-year worldwide license agreement to manufacture and distribute perfumes and related products under the Van Cleef & Arpels brand name, which was subsequently extended for a further six years until December 31, 2024. Discussions have been underway since 2023 with a view to renewing the license agreement. The new agreement will strengthen the selective distribution of Van Cleef & Arpels fragrances worldwide. The license is to be renewed for an additional 9-year term, beginning January 1, 2025.	In 2006, Van Cleef & Arpels and Interparfums SA signed a 12-year worldwide license agreement to manufacture and distribute perfumes and related products under the Van Cleef & Arpels brand name, which was subsequently extended for a further six years until December 31, 2024. Discussions have been underway since 2023 with a view to renewing the license agreement. The new agreement will strengthen the selective distribution of Van Cleef & Arpels fragrances worldwide. The license is to be renewed for an additional 9-year term, beginning January 1, 2025.
Roberto Cavalli [Member]
Business Acquisition [Line Items]
Description of recent agreement			The license became effective in July 2023 and will last for 6.5 years.	The license became effective in July 2023 and will last for 6.5 years.
Lacoste Member
Business Acquisition [Line Items]
Description of recent agreement			The license became effective in January 2024 and will last for 15 years	The license became effective in January 2024 and will last for 15 years
Rochas Fashion [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Impairment of intangible assets	$ 6.8	$ 2.4
Net book value for finite-lived Intangible assets			$ 11.9