Note 8 - Stock-Based Compensation (Details) - Phantom Stock Plan (Phantom Share Units (PSUs) [Member], USD $)	3 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Phantom Share Units (PSUs) [Member]
Note 8 - Stock-Based Compensation (Details) - Phantom Stock Plan [Line Items]
Granted	8,126
Granted	$ 19.84
Forfeited	(13)
Forfeited	$ 21.51
Distributions	(305)
Distributions	$ 20.34
Shares	67,131	59,323
Fair Value	$ 21.07	$ 20.70
Vested at March 31, 2014	66,874
Vested at March 31, 2014	$ 21.07

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Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments Distributed, Fair Value

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- Definition

Share-based compensation arrangement by share based payment award non option equity instruments forfeitures fair value.

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Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments Vested, Fair Value

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Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments, Vested, Number

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Other increase (decrease) in number of shares reserved for issuance under non-option equity instrument agreements that is not separately disclosed.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(i)

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

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

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