Note 11 - Stock-Based Compensation (Details) - Stock Options Exercised (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options Exercised [Abstract]
Proceeds from stock options exercised	$ 565	$ 533	$ 885
Fair value of shares received upon exercise of stock options	1,962	6,814	905
Tax benefit related to stock options exercised	88	151	56
Intrinsic value of stock options exercised	$ 488	$ 1,228	$ 256
Weighted average fair value on grant date (in Dollars per share)

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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 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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Value of stock issued as a result of the exercise of stock options.

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-Name Regulation S-X (SX)

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-Section 04

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