Represents the employee stock purchase plan (ESPP) offering and purchase periods.

No definition available.

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- Definition

An increase in the amount authorized by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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- Definition

The number of stack awards counted for every share granted or canceled when computed shares available for grant.

+ References

No definition available.

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- Definition

The percentage of stock option exercisable.

+ References

No definition available.

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The contractual term of the options granted.

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No definition available.

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The net amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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No definition available.

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Refers to Share based compensation by share based payment fully vested stock awards grant date fair value.

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No definition available.

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The forfeiture rate of share based compensation.

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No definition available.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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No definition available.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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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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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Net number of non-option equity instruments granted to participants.

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

+ References

No definition available.

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

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No definition available.

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

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

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Amount remaining of a stock repurchase plan authorized.

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No definition available.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Note 6 - Stockholders' Equity, Stock Plans and Stock-based Compensation Expense (Details Textual) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 15, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 28, 2017	Feb. 13, 2017	Feb. 08, 2016	Feb. 18, 2015	Feb. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 8,000,000	$ 3,600,000	$ 5,100,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options, Net			$ 4,000,000	$ 9,500,000	$ 10,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			278,250	162,000	129,000
Shares Paid for Tax Withholding for Share Based Compensation			64,490	56,157	68,101
Adjustments Related to Tax Withholding for Share-based Compensation			$ 1,469,000	$ 619,000	$ 1,000,000
Minimum [Member]
Share Based Compensation, Forfeiture Rate		0.00%	0.00%
Maximum [Member]
Share Based Compensation, Forfeiture Rate		13.00%	13.00%
Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			7,745	0
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
Option Granted Contractual Term							7 years	7 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 11,500,000	$ 11,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 281 days
Employee Stock Option [Member] \| Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Employee Stock Option [Member] \| Non-employees [Member] \| Vesting on First Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Employee Stock Option [Member] \| Non-employees [Member] \| Vesting Each Month After First Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			0.02083%
Restricted Stock Units (RSUs) [Member]
Share Price		$ 45.35	$ 45.35	$ 17.35	$ 12.79	$ 10.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 2,500,000	$ 2,200,000	$ 2,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			412,208	480,191	203,104
Restricted Stock Units (RSUs) [Member] \| Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			2,478	0
Restricted Stock Units (RSUs) [Member] \| Non-employees [Member] \| Vesting Each Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					255 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			117,418	204,976	74,667
Performance Shares [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			104,500
Performance Shares [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted		12,918
Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 252,000	$ 252,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			120 days
1998 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		4,650,000	4,650,000
Two Thousand Four Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		1,750,000	1,750,000
Number of Stock Awards Counted for Every Share Granted or Canceled			2.12
Share Based Compensation by Share Based Payment Fully Vested Stock Awards Grant Date Fair Value							$ 60,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			21,605	45,350	21,020
Two Thousand Four Equity Incentive Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Option Exercisable in Hundredths			25.00%
Share Price		$ 45.35	$ 45.35	$ 17.35	$ 12.79	$ 10.68
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share Based Compensation by Share Based Payment Fully Vested Stock Awards Grant Date Fair Value				$ 6,500			$ 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			270,707	229,865	107,417
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	15.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	15.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	45.00%
2004 Employee Stock Purchase Plan [Member]
ESPP Offering and Purchase Period			180 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized			600,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			85.00%
Stock Issued During Period, Shares, Employee Stock Ownership Plan			78,479	79,922	55,872
Common Stock, Capital Shares Reserved for Future Issuance		691,584	691,584
Modified Stock Buyback Program [Member]
Increase in Authorized Amount Under Stock Repurchase Plan						$ 10,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount									$ 25,000,000	$ 5,000,000	$ 10,000,000	$ 40,000,000	$ 10,000,000
Stock Repurchased During Period, Shares			1,022,602	455,311	2,818,038
Treasury Stock, Value, Acquired, Cost Method			$ 35,200,000	$ 4,900,000	$ 40,000,000