Note 15 - Stock-Based Compensation (Details) - Stock Option Plans (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Option Plans [Abstract]
Outstanding, beginning	662,506	608,852	535,130
Outstanding, beginning	$ 13.82	$ 13.27	$ 13.85
Outstanding, ending	661,771	662,506	608,852
Outstanding, ending	$ 13.89	$ 13.82	$ 13.27
Exercisable, ending	420,429	419,735	391,378
Weighted average fair value per option of options granted during the period	$ 5.68	$ 5.14	$ 2.79
Granted	82,609	96,232	102,722
Granted	$ 17.11	$ 15.68	$ 9.30
Exercised	(23,659)	(41,258)	(17,876)
Exercised	$ 10.22	$ 10.06	$ 9.68
Forfeited	(59,685)	(1,320)	(11,124)
Forfeited	$ 19.02	$ 10.53	$ 10.57

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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-Name Regulation S-X (SX)

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