Equipment under operating leases, net (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Impairment losses on equipment		$ 58,000	$ 0	$ 619,000
Depreciation of operating lease assets	$ 342,000	351,000	$ 1,065,000	1,315,000
Average estimated residual value of assets on operating leases	20.00%		20.00%		20.00%
Operating leases in non-accrual status	$ 0		$ 0		$ 0
Operating Leases [Member]
Impairment losses on equipment	0		0
Depreciation of operating lease assets	342,000	351,000	1,100,000	1,300,000
Additional depreciation recorded to reflect year-to-date changes	$ 7,000	$ 6,000	$ 36,000	$ 276,000