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Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Carrying Value
Book and estimated fair values of financial instruments
Net investment in leases	$ 28	$ 43
Loans receivable and other lending investments	332	333
Loans receivable held for sale	0	43
Cash and cash equivalents	1,500	340
Restricted cash	51	54
Debt obligations, net	2,084	2,572
Carrying Value | Fair Value, Inputs, Level 1
Book and estimated fair values of financial instruments
Debt obligations, net	1,985	2,473
Carrying Value | Fair Value, Inputs, Level 3
Book and estimated fair values of financial instruments
Debt obligations, net	99	99
Fair Value
Book and estimated fair values of financial instruments
Net investment in leases	28	43
Loans receivable and other lending investments	342	345
Loans receivable held for sale	0	43
Cash and cash equivalents	1,500	340
Restricted cash	51	54
Debt obligations, net	2,329	2,903
Fair Value | Fair Value, Inputs, Level 1
Book and estimated fair values of financial instruments
Debt obligations, net	2,228	2,799
Fair Value | Fair Value, Inputs, Level 3
Book and estimated fair values of financial instruments
Debt obligations, net	$ 101	104
3.125% Senior Convertible Notes
Book and estimated fair values of financial instruments
Stated interest rate	3.125%		3.125%
3.125% Senior Convertible Notes | Unsecured notes
Book and estimated fair values of financial instruments
Debt obligations, net	$ 497,500	$ 527,500
Stated interest rate	3.125%	3.125%	3.125%

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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