Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Measurements [Abstract]

Schedule of fair value measurement on a recurring basis

March 31, 2022

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	1,324	$	1,324	$	1,324	$	0	$	0
Treasury bills		5,997		5,997		5,997		0		0
Treasury bills - maturity date greater than three months		2,000		2,000		2,000		0		0
Equity Securities		56		56		0		0		56

December 31, 2021

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	1,520	$	1,520	$	1,520	$	0	$	0
Treasury bills		5,000		5,000		5,000		0		0
Treasury Bills - maturity date greater than three months		3,000		3,000		3,000		0		0
Equity Securities		56		56		0		0		56

Summary of change in level 3 assets at fair value on a recurring basis

	Three Months Ended March 31,
	2022		2021
Beginning Balance	$	56	$	42
Change in Fair Value		0		0
Ending Balance	$	56	$	42