Concentration of Credit Risk and Major Customers (Schedule of Leasing and Lending Revenues) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Natural Gas [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	63.00%	46.00%
Marine Vessel [Member] | Halliburton Overseas Limited [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	37.00%	39.00%
Transportation, Rail [Member] | The Kansas City Southern Railway Company [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	20.00%	11.00%
Manufacturing [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk	17.00%	17.00%
Manufacturing [Member] | GE Aviation [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Percentage of concentration risk		11.00%
Food and Beverage [Member] | Equipment Cost [Member]
Concentration Risk [Line Items]
Percentage of concentration risk		11.00%