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Note 6 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants (USD $)	1 Months Ended		3 Months Ended
	Mar. 31, 2014	Feb. 28, 2014	Mar. 31, 2014	Mar. 31, 2013
Note 6 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants [Line Items]
Issued			$ 32.77	$ 20.03
Restricted Stock [Member]
Note 6 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants [Line Items]
Unvested at Beginning			614,580	348,353
Unvested at Beginning			$ 18.71	$ 13.79
Issued	20,760	58,187	78,947	421,425
Issued			$ 33.24	$ 20.63
Forfeited			(434)
Forfeited			$ 15.67
Vested			(181,967)	(154,705)
Vested			$ 17.59	$ 13.06
Unvested at End	511,126		511,126	615,073
Unvested at End	$ 21.36		$ 21.36	$ 18.66

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Topic 718

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB

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-Topic 718

-SubTopic 10

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Name Accounting Standards Codification

-Topic 718

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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