Note 6 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

	December 31, 2015									December 31, 2014
	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	$	(423,000	)	$	51,000		5.0	$	474,000	$	(403,000	)	$	71,000

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

2016	$	18,000
2017		11,000
2018		6,000
2019 `		4,000
2020		2,000
Thereafter		10,000
	$	51,000