Note 10 - Shareholders' Equity (Details Textual) - USD ($) xbrli-pure in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Repurchased and Retired During Period, Shares	2,453,900	973,100
Payments for Repurchase of Common Stock	$ 6,773,000	$ 2,110,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,505,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	855,000	120,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,065,000	225,000	580,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 29,000	$ 340,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 803,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 149 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	15,000	475,000
Proceeds from Stock Options Exercised	$ 17,000	$ 765,000
The2004 Plan Member
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	4,205,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
The2004 Plan Member \| Granted in 2004 and 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

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 to reacquire common stock during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

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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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Number of share options (or share units) exercised during the current period.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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