The number of warrants or rights exercised during period.

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Maximum percent employees can elect to withhold from their base earnings to purchase common stock.

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The weighted average fair value of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Number of warrants exercised during the current period.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Number of warrants or rights outstanding.

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Aggregate number of common shares reserved for future issuance.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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 accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 share instruments newly issued under a share-based compensation plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Price of a single share of a number of saleable stocks of a company.

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

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Number of new stock issued during the period.

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Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended													12 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jan. 31, 2017	Jun. 30, 2016	May 31, 2015	May 30, 2015	May 31, 2014	Jun. 30, 2011	May 31, 2010	May 31, 2009	Dec. 31, 2007	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2014
Proceeds from Issuance of Common Stock	$ 194.4	$ 168.7	$ 142.6		$ 163.7
Class of Warrant or Right, Number of Securities Called by Warrants or Rights														640,164
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price														$ 11.97	$ 8.49	$ 8.37
Common Stock, Shares, Issued, Total			64,609,000											78,174,000	64,609,000
Common Stock, Capital Shares Reserved for Future Issuance														25,927,688
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant														1,354,280
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period														10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period														667,338
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price														$ 17.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period														53,521
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price														$ 29.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term														5 years 109 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value														$ 31.4	$ 9.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value			$ 35.6											$ 75.7	$ 35.6
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options, Ending Balance														15,264,606
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				200,000		100,000		100,000	25,000	25,000		10,000	5,000	475,000
Share-based Compensation Arrangement by Share-based Payment Award Maximum Employee Earnings with held to Purchase Common Stock Percent														10.00%
Share-based Compensation Arrangement by Share-based Payment Award Discount on Stock Price														85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period														71,499	77,283	54,932
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price														$ 16.48	$ 12.80	$ 14.03
Common Stock, Shares, Issued, Total														279,182
Common Stock, Capital Shares Reserved for Future Issuance														195,818
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total														$ 117.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition														2 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value														$ 17.24	10.61	11.82
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted-average Fair Value Price of Shares Purchased			$ 4.51											$ 9.95	$ 4.51	$ 6.10
Equity Incentive Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized				5,000,000		3,000,000	4,300,000		1,750,000	4,500,000	100,000			18,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized													150,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant														1,354,280
Pre-funded Warrants[Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																	600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights																	$ 0.01
Class of Warrant or Right, Exercised During Period															4,426
Class of Warrant or Right, Outstanding														595,574
Common Stock [Member]
Stock Issued During Period, Shares, New Issues	5,100,000	6,900,000	9,700,000		14,100,000									11,963,000	23,822,000
Share Price	$ 39.50	$ 26	$ 15.50		$ 12.20										$ 15.50
Payments of Stock Issuance Costs	$ 5.6	$ 10.7	$ 7.4		$ 8.8
Stock Issued During Period, Shares, Warrants Exercised															4,000	2,396,000
Common Stock [Member] \| Pre-funded Warrants[Member]
Stock Issued During Period, Shares, Warrants Exercised															4,423