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Note 9 - Stock-based Compensation (Details) - Phantom Stock Plan - Phantom Stock Plan [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Note 9 - Stock-based Compensation (Details) - Phantom Stock Plan [Line Items]
Shares | shares	67,113
Fair Value	$ 20.27
Vested at September 30, 2015 | shares	78,857
Vested at September 30, 2015	$ 20.02
Granted | shares	12,356
Granted	$ 19.32
Forfeited | shares	(2)
Forfeited	$ 20.58
Distributions | shares	(451)
Distributions	$ 19.64
Shares | shares	79,016
Fair Value	$ 20.02

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-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



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