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Note 9 - Stock Options (Details Textual) $ in Thousands |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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, 2016 USD ($) shares | Dec. 31, 2015 shares | Mar. 19, 2015 shares | Dec. 31, 2014 shares
Number of Stock-based Compensation Plans |  |  |  |  |  |  | 2 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  | 2,254,000 | 2,598,000 |  | 3,076,000
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  | 3,852,609 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisable Period 1 |  |  |  |  |  |  | 1 year |  |  |
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 | $ |  |  |  |  |  |  | $ 37 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  | 306 days |  |  |
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 |  |  |  |  |  |  |  | 768,835 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  |  | 2,185,167 |  |
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 |  |  |  |  |  |  |  | 937,998 |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  | 2,185,000 |  |  |
The 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 531,000 |  | 600,000 |
Aggregate Stock Options Exercised for the Plan |  |  |  |  |  |  | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  | 69,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants Aggregate |  |  |  |  |  |  | 72,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options Forfeitures Aggregate |  |  |  |  |  |  | 3,000 |  |  |
Number of Equity Incentive Programs |  |  |  |  |  |  | 3 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  | 600,000 |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  |  |  |  | 0 |  |  |
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 |  |  |  |  |  |  | 3 years |  |  |
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 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Period for Which Individual Should Serve As Member of Non Employee Board |  |  |  |  |  |  | 3 years |  |  |

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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. + Details
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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. + Details
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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. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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