Investments - Summary of Operating and Balance Sheet Data (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Investment Company, Financial Highlights [Line Items]
Expenses	$ (1,257,703)	$ (855,473)
Polyform Products, Co.
Investment Company, Financial Highlights [Line Items]
Revenues	4,075,089	4,405,864
Expenses	(4,207,185)	(4,397,038)
(Loss) income before income taxes	(132,096)	8,826
Income tax benefit (expense)	37,000	(3,000)
Net Income (loss)	(95,096)	(5,826)
Current assets	7,318,843		$ 5,917,238
Non-current assets	31,120,055		31,474,762
Current liabilities	2,676,525		1,484,148
Non-current liabilities	21,040,935		21,123,045
Stockholders’ equity	14,721,438		14,784,807
Lawn Doctor, Inc.
Investment Company, Financial Highlights [Line Items]
Revenues	6,723,173	6,451,501
Expenses	(7,082,077)	(6,690,735)
(Loss) income before income taxes	(358,904)	(239,234)
Income tax benefit (expense)	111,500	63,588
Consolidated net loss	(247,404)	(175,646)
Net loss attributable to non-controlling interest	71,310	36,635
Net Income (loss)	176,094	$ 139,011
Current assets	10,176,387		5,679,790
Non-current assets	94,167,915		96,327,351
Current liabilities	4,943,885		5,208,665
Non-current liabilities	56,006,676		52,854,284
Non-controlling interest	(250,435)		(179,125)
Stockholders’ equity	43,644,176		44,123,317
Roundtables [Member]
Investment Company, Financial Highlights [Line Items]
Revenues	2,691,899
Expenses	(3,386,663)
(Loss) income before income taxes	(694,764)
Income tax benefit (expense)	176,758
Net Income (loss)	518,006
Current assets	8,912,619		2,495,539
Non-current assets	60,733,542		61,232,699
Current liabilities	10,299,339		3,686,652
Non-current liabilities	20,769,470		20,946,228
Stockholders’ equity	$ 38,577,352		$ 39,095,358