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Note 10 - Treasury Stock	3 Months Ended
	Mar. 31, 2018
Notes to Financial Statements
Treasury Stock [Text Block]	10. TREASURY STOCK Treasury stock is recorded at cost and is presented as a reduction of stockholders’ equity in the condensed consolidated financial statements. Share Repurchase Program. On July 1, 2015, the Company’s board of directors (the “Board”) authorized up to $250 million of share repurchases (subject to a total cap of 600,000 shares of common stock). Purchases under the share repurchase program may be made from time to time on the open market and in privately negotiated transactions. The size and timing of these purchases are based on a number of factors, including share price and business and market conditions. Since the inception of the share repurchase program through March 31, 2018, the Company had repurchased 169,144 shares at an aggregate cost of $75.6 million. During the three months ended March 31, 2018, the Company repurchased 3,311 shares at an aggregate cost of $2.3 million. Tax Withholding for Equity Awards . Shares of common stock with a fair market value equal to the applicable statutory minimum amount of the employee withholding taxes due are withheld by the Company upon vesting of restricted stock and exercises of stock appreciation rights (“SARs”) to pay the applicable statutory minimum amount of employee withholding taxes and are considered common stock repurchases. The Company then pays the applicable statutory minimum amount of withholding taxes in cash. The amount remitted during the three months ended March 31, 2018 was $7.2 million, for which the Company withheld 9,767 shares of common stock. Treasury shares of 155,458 held at March 31, 2018 include such shares withheld for withholding tax.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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