Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2023

Marketable Securities

Schedule of marketable securities

	Marketable equity securities at December 31, 2023
			Gross unrealized		Gross unrealized
	Cost		gains		losses			Fair value
Common shares	$	5,119,000	$	12,000	$	(5,104,000	)	$	27,000
		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