Note 6 - Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Goodwill and Intangible Assets Disclosure [Text Block]

6 . Goodwill and Intangible Assets

Management evaluates goodwill for impairment on an annual basis (

fourth

quarter), and

no

impairment charge was identified for the years presented.

Definite-lived intangible assets, consisting of patents and trademarks, are amortized over their useful lives. Intangible assets consisted of the following:

	December 31, 2018									December 31, 2017
	Weighted Average Amortization Period (Years)		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization Period (Years)		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents and Trademarks		3.0	$	474,000	$	(458,000	)	$	16,000		4.0	$	474,000	$	(453,000	)	$	21,000

Amortization expense for intangible assets was

$5,000

and

$13,000

for the years ended

December 31, 2018

and

2017,

respectively.

Estimated future amortization expense related to definite-lived intangible assets is as follows:

Year s ending December 31 ,
2019	$	4,000
2020		3,000
2021		2,000
2022		2,000
2023		2,000
Thereafter		3,000
	$	16,000