Allowance for Doubtful Accounts

12 Months Ended

Dec. 31, 2021

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

3. Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts are composed of the following:

	Years Ended December 31,
	2021		2020
Balance, beginning of year	$	50	$	50
Provision for doubtful accounts		-		-
Uncollectible accounts written off		-		-
Balance, end of year	$	50	$	50