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Note 5 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Stock Repurchased and Retired [Table Text Block]

		Repurchases Occurring in the Three Months Ended March 31, 2017								Cumulative Repurchases as of March 31, 2017
		Shares				Average Price				Shares				Average Price
2016 Share Repurchase Authorization			62,000			$	96.94				775,725			$	81.12

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Tabular disclosure of stock repurchased and retired during the period.

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