Note 6 - Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

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, 2014									December 31, 2013
	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		5.0	$	474,000	$	(403,000	)	$	71,000		6.0	$	474,000	$	(382,000	)	$	92,000

Amortization expense for intangible assets was $20,000 and $22,000 for the years ended December 31, 2014 and 2013, respectively. 

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

Years ending December 31,
2015	$	20,000
2016		18,000
2017		11,000
2018		6,000
2019		4,000
Thereafter		12,000
	$	71,000