Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Summary of Significant Accounting Policies [Abstract]

Fair Value of MSA Escrow Account

Fair values for the U.S. Governmental agency obligations are Level 2 in the fair value hierarchy. The following tables show cost and estimated fair value of the assets held in the MSA account, respectively, as well as the maturities of the U.S. Governmental agency obligations held in such account for the periods indicated.

	As of March 31, 2022									As of December 31, 2021
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash and cash equivalents	$	3,673	$	-	$	-		$	3,673	$	12,155	$	-	$	-		$	12,155
U.S. Governmental agency obligations (unrealized position < 12 months)		21,452		5		(1,145	)		20,312		19,918		4		(357	)		19,565
U.S. Governmental agency obligations (unrealized position > 12 months)		6,948		-		(696	)		6,252		-		-		-			-
	$	32,073	$	5	$	(1,841	)	$	30,237	$	32,073	$	4	$	(357	)	$	31,720

Maturities of U.S. Governmental Agency Obligations

	As of
	March 31, 2022
Less than one year	$	-
One to five years		7,443
Five to ten years		20,001
Greater than ten years		956
Total	$	28,400

Deposits by Sales Year for MSA Escrow Account

The following shows the amount of deposits by sales year for the MSA escrow account:

	Deposits as of
Sales Year	March 31, 2022		December 31, 2021
1999	$	211	$	211
2000		1,017		1,017
2001		1,673		1,673
2002		2,271		2,271
2003		4,249		4,249
2004		3,714		3,714
2005		4,553		4,553
2006		3,847		3,847
2007		4,167		4,167
2008		3,364		3,364
2009		1,619		1,619
2010		406		406
2011		193		193
2012		199		199
2013		173		173
2014		143		143
2015		101		101
2016		91		91
2017		82		82
Total	$	32,073	$	32,073