Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financial assets:
Cash and cash equivalents	$ 1,647		$ 3,238
Investment in equity securities	1		1
Warrants, fair value	78		75
Financial liabilities:
Non-recourse debt	510		750
Level 1 Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,647		3,238
Investment in equity securities	1		1
Warrants, fair value	0		0
Financial liabilities:
Non-recourse debt	0		0
Level 2 Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	0		0
Investment in equity securities	0		0
Warrants, fair value	0		0
Financial liabilities:
Non-recourse debt	0		0
Level 3 Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	0		0
Investment in equity securities	0		0
Warrants, fair value	78	$ 74	75	$ 102	$ 106	$ 108
Financial liabilities:
Non-recourse debt	510		750
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,647		3,238
Investment in equity securities	1		1
Warrants, fair value	78		75
Financial liabilities:
Non-recourse debt	$ 520		$ 770

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