Note 11 - Stock-Based Compensation (Details) - Phantom Stock Plan (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2012
Phantom Stock Plan [Abstract]
Shares		59,323
Fair Value		$ 20.70
Vested at December 31, 2014	66,996
Vested at December 31, 2014	$ 20.27
Granted	9,631
Granted	$ 19.85
Forfeited	(56)
Forfeited	$ 19.73
Distributions	(1,785)
Distributions	$ 19.60
Shares	67,113	59,323
Fair Value	$ 20.27	$ 20.70

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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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.

+ References

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- Definition

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

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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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