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Note 11 - Stock-Based Compensation (Details) - Phantom Stock Plan - Phantom Stock Plan [Member]	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Note 11 - Stock-Based Compensation (Details) - Phantom Stock Plan [Line Items]
Shares | shares	67,113
Fair Value | $ / shares	$ 20.27
Vested at December 31, 2015 | shares	78,857
Vested at December 31, 2015 | $ / shares	$ 21.64
Granted | shares	12,924
Granted | $ / shares	$ 19.44
Forfeited | shares	(3)
Forfeited | $ / shares	$ 20.78
Distributions | shares	(594)
Distributions | $ / shares	$ 19.82
Shares | shares	79,440
Fair Value | $ / shares	$ 21.64

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Represents share based compensation arrangement by share based payment award, non option equity instruments distributed, fair value.

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Represents share-based compensation arrangement by share-based payment award, non-option equity instruments, granted, fair value.

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Represents share-based compensation arrangement by share-based payment award, non option equity instruments vested, fair value.

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

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

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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)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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

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