Note 6 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	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

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

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