Note 6 - Definite-lived Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Patents and Trademarks [Member]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Gross Carrying Amount	$ 474,000	$ 474,000
Accumulated Amortization	(423,000)	(403,000)
Net Carrying Amount	51,000	71,000
Net Carrying Amount	$ 51,000	$ 71,000