Concentration of Credit Risk and Major Customers (Schedule of Leasing and Lending Revenues) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Transportation, Rail [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	26.00%	30.00%
Transportation, Rail [Member] | Union Pacific Railroad Company [Member] | Operating Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	22.00%	22.00%
Mining [Member] | Aggregate Industries Management, Inc. [Member] | Operating Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	15.00%	11.00%
Agriculture [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk		11.00%
Agriculture [Member] | Cargill, Inc. [Member] | Operating Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	11.00%	11.00%
Construction [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	21.00%	14.00%
Transportation, Air [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk		10.00%