Schedule II - Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Valuation And Qualifying Accounts Disclosure Table [Table Text Block]

			Additions
Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions			Balance at End of Period
Year Ended December 31, 2020
Reserve for doubtful accounts	$	18,325	$	1,648		-		$	19,973
Reserve for inventory obsolescence		250,606		64,739		-			315,345
Reserve for product warranty		302,486		253,461		(350,947	)		205,000
Valuation allowance for deferred taxes		47,319		-		-			47,319
Reserve for uncertain tax positions	$	395,000	$	30,000	$	-		$	425,000
Year Ended December 31, 2021
Reserve for doubtful accounts	$	19,973	$	55,957		-		$	75,930
Reserve for inventory obsolescence		315,345		137,262		-			452,607
Reserve for product warranty		205,000		190,097		(364,714	)		30,383
Valuation allowance for deferred taxes		47,319		-		-			47,319
Reserve for uncertain tax positions	$	425,000	$	165,000	$	-		$	590,000