Represents the aggregate number of stock options that have been issued under the stock option plan.

No definition available.

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- Definition

Represents the number of separate equity incentive programs of the entity.

+ References

No definition available.

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- Definition

Represents the number of stock-based compensation plans of the entity.

+ References

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- Definition

Represents the options exercisable period one.

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No definition available.

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Represents the options exercisable period two.

+ References

No definition available.

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- Definition

Represents the options exercisable period three.

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No definition available.

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- Definition

Represents the exercise price expressed as a percentage of the fair market value of common stock in case of optionees holding more than specified percent of voting stock of the entity.

+ References

No definition available.

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- Definition

Represents the option that will be granted to purchase shares of common stock on the date of each annual stockholders meeting, provided he or she has served as a non-employee Board member for at least six months for the entity.

+ References

No definition available.

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- Definition

The aggregate number of shares under options that have been cancelled under the stock option plan as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

No definition available.

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- Definition

Aggregate number of share options (or share units) granted under the stock option plan.

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No definition available.

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- Definition

Represents the number of share options of common stock that will be granted under the stock based compensation plan upon initial election or appointment to the Board, provided that individual has not previously been employed by the entity in the preceding six months.

+ References

No definition available.

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- Definition

Represents the preceding period within which an individual should not be previously employed by the entity to receive an option grant for shares of common stock upon initial election or appointment to the Board.

+ References

No definition available.

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- Definition

Represents the percentage of voting stock to be held by optionees for entitlement to exercise price less than the specified percentage of the fair market value of common stock.

+ References

No definition available.

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- Definition

The period of time from the grant date until the time at which the share-based option award expires for holders of incentive stock options of more than the specified percentage of voting stock.

+ References

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

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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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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

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

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- Definition

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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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Note 8 - Stock Options (Details Textual) $ in Thousands							12 Months Ended
Note 8 - Stock Options (Details Textual) $ in Thousands	May 17, 2012 shares	May 19, 2011 shares	May 20, 2010 shares	May 21, 2009 shares	May 29, 2008 shares	May 30, 2007 shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Mar. 19, 2015 shares
Number of Stock-based Compensation Plans							2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance							1,235,000	1,746,000	2,254,000
Common Stock, Capital Shares Reserved for Future Issuance							2,785,042
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 2							3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 3							5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period							10 years
Share-based Compensation Arrangements By Share-based Payment Award, Options Expiration Term For Options Granted To Holders Of More Than Specified Percentage Of Voting Stock							5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options \| $							$ 16
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition							1 year 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 1							1 year
Maximum [Member]
Share-based Compensation Arrangement By Share-based Payment Award Of Exercise Price Of Common Stock Percentage In Case Of Optionees Holding More Than Specified Percentage Of Voting Stock							110.00%
Minimum [Member]
Share-based Compensation Arrangement By Share-based Payment Award Voting Stock Percentage To Be Held By Optionees							10.00%
The 2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,700,000	3,400,000	3,000,000	2,500,000		1,500,000	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	300,000	400,000	500,000	500,000	500,000	750,000
Aggregate Stock Options Exercised for the Plan							1,269,735
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance							1,117,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants Aggregate							3,892,000
Share-based Compensation Arrangement by Share-based Payment Award, Options Forfeitures Aggregate							1,504,665
Common Stock, Capital Shares Reserved for Future Issuance							1,118,000
The 2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							483,000			600,000
Aggregate Stock Options Exercised for the Plan							0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance							117,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants Aggregate							120,000
Share-based Compensation Arrangement by Share-based Payment Award, Options Forfeitures Aggregate							3,000
Number of Equity Incentive Programs							3
Stock Issued During Period, Shares, Share-based Compensation, Gross							0
Common Stock, Capital Shares Reserved for Future Issuance							600,000
The 2015 Stock Incentive Plan [Member] \| Non-employee Board Member [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options That Will Be Granted Upon Initial Election Or Appointment to Board							10,000
Share-based Compensation Arrangement by Share-based Payment Award, Preceding Period With in Which Individual Should Not Be Employed							90 days
Share-based Compensation Arrangement by Share-based Payment Award, Option That Will Be Granted to Purchase Shares On Date of Each Annual Stockholders Meeting							8,000