Fair Value Measurements (Details Textual) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-Lived License Agreements	$ 95,311,000	$ 95,250,000	$ 93,259,000	$ 95,311,000	$ 95,250,000	$ 93,259,000
Assets, Fair Value Disclosure	0			0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 0	1,449,000	$ 0	$ 0	1,449,000
Other intangibles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-Lived License Agreements			3,649,000			3,649,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)						1,449,000
Other intangibles [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure			$ 2,200,000			$ 2,200,000