Note 11 - Capital Stock and Stock Options Share-based compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
number of stock options non-employee directors received on first day of trading after annual meeting of stockholders	2,500
number of months non-employee directors stock options will vest	12 months
number of years non-employee director options are exercisable from the date of the grant	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number - Begin	4,176,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	135,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(900,801)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(276,110)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number - End	3,135,505	4,176,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	3,095,611
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,671,717	3,513,999	3,790,942
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price - Begin	$ 13.50
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 10.53
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 10.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 13.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price- End	$ 14.25	$ 13.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 14.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 14.90	$ 14.26	$ 13.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 6.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	6.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	5.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Contractual Term	6 years 2 months 5 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Contractual Term	6 years 1 month 10 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Contractual Term	5 years 4 months 20 days	4 years 7 months 17 days	4 years 10 months 27 days
Stock or Unit Option Plan Expense	0.9us-gaap_StockOptionPlanExpense	1.2us-gaap_StockOptionPlanExpense	1.2us-gaap_StockOptionPlanExpense
Allocated Share-based Compensation Expense, Net of Tax	0.5	0.7	0.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	4 years
Excess tax benefits related to stock option exercises, period for recognition	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 4.80	$ 5.28	$ 2.02
Employee Stock Option [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Up to Number	8,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Lower Limit to Award Vesting Period	36 months
Share-based Compensation Arrangement by Share-based Payment Award, Upper Limit to Award Vesting Period	48 months
Share-based compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 4.10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 20.27
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 1.8
2002 Equity Incentive Stock Option Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	22,434
2007 Equity Incentive Stock Option Plan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,596,474

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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