Operating Segments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease revenue	$ 15,468,100	$ 25,609,000
Finance lease revenue	56,200	852,600
Africa
Finance lease revenue	0	487,000
North America
Operating lease revenue	10,119,100	10,119,100
Europe and United Kingdom
Operating lease revenue	5,349,000	15,174,900
Finance lease revenue	56,200	365,600
Asia
Operating lease revenue	$ 0	$ 315,000