Note 6 - Stockholders' Equity, Stock Plans and Stock-based Compensation Expense (Details) - Options Outstanding and Exercisable Price Ranges (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number Outstanding (in Shares)		2,221,657
Options Exercisable, Weighted-Average Exercise Price		$ 10.14
Exercise Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 6.54
Options Outstanding, Number Outstanding (in Shares)	17,125
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 109 days
Options Exercisable, Number Outstanding (in Shares)	17,125
Options Exercisable, Weighted-Average Exercise Price	$ 6.54
Exercise Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 6.88
Options Outstanding, Number Outstanding (in Shares)	460,530
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 135 days
Options Exercisable, Number Outstanding (in Shares)	278,266
Options Exercisable, Weighted-Average Exercise Price	$ 6.88
Exercise Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 7.11
Range of Exercise Prices, Upper Limit	$ 8.66
Options Outstanding, Number Outstanding (in Shares)	442,525
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 229 days
Options Exercisable, Number Outstanding (in Shares)	428.942
Options Exercisable, Weighted-Average Exercise Price	$ 8.53
Exercise Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 8.72
Options Outstanding, Number Outstanding (in Shares)	473,989
Options Outstanding, Weighted-Average Remaining Contractual Life	3 years 76 days
Options Exercisable, Number Outstanding (in Shares)	431,615
Options Exercisable, Weighted-Average Exercise Price	$ 8.72
Exercise Price Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 8.80
Options Outstanding, Number Outstanding (in Shares)	553,795
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 29 days
Options Exercisable, Number Outstanding (in Shares)	196,926
Options Exercisable, Weighted-Average Exercise Price	$ 8.80
Exercise Price Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 8.81
Range of Exercise Prices, Upper Limit	$ 9.65
Options Outstanding, Number Outstanding (in Shares)	432,778
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 171 days
Options Exercisable, Number Outstanding (in Shares)	114,960
Options Exercisable, Weighted-Average Exercise Price	$ 9.15
Exercise Price Range 7 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.74
Range of Exercise Prices, Upper Limit	$ 10.03
Options Outstanding, Number Outstanding (in Shares)	183,000
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 240 days
Options Exercisable, Number Outstanding (in Shares)	28,000
Options Exercisable, Weighted-Average Exercise Price	$ 9.74
Exercise Price Range 8 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 10.24
Options Outstanding, Number Outstanding (in Shares)	441,325
Options Outstanding, Weighted-Average Remaining Contractual Life	2 years 76 days
Options Exercisable, Number Outstanding (in Shares)	441,325
Options Exercisable, Weighted-Average Exercise Price	$ 10.24
Exercise Price Range 9 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 10.32
Range of Exercise Prices, Upper Limit	$ 14.78
Options Outstanding, Number Outstanding (in Shares)	354,500
Options Outstanding, Weighted-Average Remaining Contractual Life	1 year 131 days
Options Exercisable, Number Outstanding (in Shares)	290,603
Options Exercisable, Weighted-Average Exercise Price	$ 11.14
Exercise Price Range 10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 16.25
Range of Exercise Prices, Upper Limit	$ 25.73
Options Outstanding, Number Outstanding (in Shares)	103,000
Options Outstanding, Weighted-Average Remaining Contractual Life	295 days
Options Exercisable, Number Outstanding (in Shares)	103,000
Options Exercisable, Weighted-Average Exercise Price	$ 20.93
Exercise Price Range 11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 6.54
Range of Exercise Prices, Upper Limit	$ 25.73
Options Outstanding, Number Outstanding (in Shares)	3,462,567
Options Outstanding, Weighted-Average Remaining Contractual Life	3 years 153 days
Options Exercisable, Number Outstanding (in Shares)	2,330,762
Options Exercisable, Weighted-Average Exercise Price	$ 9.62

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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