Note 6 - Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2013

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, 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, 2013									December 31, 2012
	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		6.0	$	474,000	$	(382,000	)	$	92,000		6.0	$	473,000	$	(360,000	)	$	113,000

Amortization expense for intangible assets was $22,000 and $29,000 for the years ended December 31, 2013 and 2012, respectively.

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

Years ending December 31,
2014	$	20,000
2015		20,000
2016		19,000
2017		11,000
2018		12,000
Thereafter		10,000
	$	92,000