Loans Payable - Banks (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Domestic Subsidiaries [Member]
Loans Payable - Banks (Details) [Line Items]
Line of credit, maximum borrowing amount (in Dollars)	$ 20
Maturity	Dec. 18, 2020
Domestic Subsidiaries [Member] | London Interbank Offered Rate (LIBOR) [Member]
Loans Payable - Banks (Details) [Line Items]
Basis spread over variable interest rate	2.00%
Variable rate	1.76%
Foreign Subsidiaries [Member]
Loans Payable - Banks (Details) [Line Items]
Line of credit, maximum borrowing amount (in Dollars)	$ 28
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member]
Loans Payable - Banks (Details) [Line Items]
Variable rate	0.379%
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member] | Minimum [Member]
Loans Payable - Banks (Details) [Line Items]
Basis spread over variable interest rate	0.50%
Foreign Subsidiaries [Member] | Euro Interbank Offered Rate [Member] | Maximum [Member]
Loans Payable - Banks (Details) [Line Items]
Basis spread over variable interest rate	0.80%