Note 6 - Stockholders' Equity and Equity Compensation (Details) - Additional Stock Option Information (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Additional Stock Option Information [Abstract]
Amount collected from stock option exercises	$ 1,633	$ 738
Total intrinsic value of stock option exercises	444	143
Tax benefit of stock option exercises recorded in additional paid-in-capital	34	55
Aggregate intrinsic value of outstanding stock options	7,835	6,434
Aggregate intrinsic value of exercisable stock options	$ 7,095	$ 5,500

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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