Fair Value Measurements (Details Textual) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, description of terms		We receive a cash settlement in the future if the prevailing interest rate is higher than the 3% strike price on the five year swap rate.  Alternatively, if interest rates were to decrease below the specified strike price, we would not receive a cash settlement.	We receive a cash settlement in the future if the prevailing interest rate is higher than the 1.68% five year swap strike price. The amount of future cash settlement is capped if the prevailing interest rate exceeds 2.78%. Alternatively, if interest rates were to decrease below the specified strike price, we would not receive a cash settlement.
Derivative strike rate for limited settlement			2.78%
Investment in IQHQ		$ 12,500	$ 12,500
Fair Value Measurements Recurring [Member] | RET Ventures [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment in IQHQ	[1]	2,342	2,293
Interest Rate Option [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payments for purchase of swaption		$ 5,600	$ 12,100
Derivative strike rate		3.00%	1.68%
Derivative swap rate period		5 years

[1]   (1) Investments measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.