Note 7 - Land Use Right and Patents (Details) - Patents (Patents [Member], USD $)	Jun. 30, 2013	Dec. 31, 2012
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Patents and patent applications	$ 1,366,000	$ 1,366,000
Less accumulated amortization	(1,130,000)	(1,092,000)
Total patents and patent applications	$ 236,000	$ 274,000

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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