Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Measurements

Summary of the valuation of financial instrument pricing levels

	Total		Level 1		Level 2		Level 3
September 30, 2021
Equity investments	$	1,406,000	$	1,406,000	$	—	$	—
December 31, 2020
Equity investments	$	1,322,000	$	1,322,000	$	—	$	—

Schedule of gains and losses on equity investments

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net (losses) gains recognized during the period on equity investments	$	(6,000)	$	54,000	$	86,000	$	4,000
Less: net gains recognized during the period on equity investments sold during the period		5,000		14,000		5,000		37,000
Unrealized (losses) gains recognized during the period on equity investments still held at period end	$	(11,000)	$	40,000	$	81,000	$	(33,000)