Note 10 - Shareholders' Equity (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	729,000	1,310,000
Stock Repurchased and Retired During Period, Shares	1,085,050	1,314,778
Payments for Repurchase of Common Stock (in Dollars)	$ 1,581,000	$ 1,553,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award Term	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,790,002	2,145,003	2,541,670
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, Total Intrinsic Value (in Dollars)	2,000	6,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	161,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	295 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	6,667	13,333
Proceeds from Stock Options Exercised (in Dollars)	$ 9,000	$ 16,000
The 2004 Plan after Amendment [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,000,000
The 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	3,110,000

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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

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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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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

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

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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