Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

Marketable Securities

Schedule of marketable securities

	Marketable equity securities at December 31, 2022
			Gross unrealized		Gross unrealized
	Cost		gains		losses			Fair value
Common shares	$	10,271,000	$	383,000	$	(4,064,000	)	$	6,590,000

	Marketable equity securities at December 31, 2021
			Gross unrealized		Gross unrealized
	Cost		gains		losses			Fair value
Common shares	$	53,475,000	$	32,000	$	(13,127,000	)	$	40,380,000

Schedule of marketable equity securities

	Marketable
	Equity Securities
Balance at January 1, 2021	$	2,563,000
Purchases of marketable equity securities in operations		385,235,000
Purchases of marketable equity securities		2,765,000
Conversion of debt securities to marketable securities		2,656,000
Sales of marketable equity securities in operations		(355,837,000	)
Sales of marketable equity securities		(4,062,000	)
Realized gains on marketable equity securities		27,377,000
Realized losses on marketable equity securities		(6,190,000	)
Unrealized losses on marketable equity securities		(14,127,000	)
Balance at December 31, 2021		40,380,000
Purchases of marketable equity securities in operations		107,958,000
Purchases of marketable equity securities		2,017,000
Conversion of debt securities to marketable securities		44,782,000
Conversion of loans receivable to marketable securities		11,502,000
Conversion of interest receivable to marketable securities		386,000
Sales of marketable equity securities in operations		(186,909,000	)
Sales of marketable equity securities		(11,748,000	)
Realized gains on marketable equity securities		44,307,000
Realized losses on marketable equity securities		(32,196,000	)
Unrealized losses on marketable equity securities		(13,889,000	)
Balance at December 31, 2022	$	6,590,000