Note 7 - Shareholders' Equity (Detail) - Stock option activity (USD $)	9 Months Ended
Sep. 30, 2012
Number of Shares	2,356,228
Weighted Average Exercise Price Per Share (in Dollars per share)	$ 8.34
Weighted Average Remaining Contractual Term	4 years 302 days
Vested and expected to vest as of September 30, 2012	2,232,729
Vested and expected to vest as of September 30, 2012 (in Dollars per share)	$ 7.80
Vested and expected to vest as of September 30, 2012	4 years 288 days
Options exercisable at September 30, 2012	848,930
Options exercisable at September 30, 2012 (in Dollars per share)	$ 9.01
Options exercisable at September 30, 2012	2 years 229 days
Options granted	303,150
Options granted (in Dollars per share)	$ 3.63
Options exercised	(28,000)
Options exercised (in Dollars per share)	$ 4.09
Options forfeited	(75,389)
Options forfeited (in Dollars per share)	$ 4.82
Options expired	(213,267)
Options expired (in Dollars per share)	$ 10.90
Number of Shares	2,342,722
Weighted Average Exercise Price Per Share (in Dollars per share)	$ 7.66
Weighted Average Remaining Contractual Term	4 years 302 days

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c), d(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.