Note 5 - Stock Options and Restricted Stock Awards

6 Months Ended

Jun. 30, 2015

Notes to Financial Statements

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

5

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Stock Options and Restricted Stock Awards

The Company accounts for stock-based compensation in accordance with

Accounting Standards Codification (“ASC”) 718-10, “Compensation – Stock Compensation,” which requires the measurement and recognition of compensation expense for all share-based payment awards made to our employees and directors, including employee stock options, restricted share awards and employee stock purchases related to the Employee Stock Purchase Plan based on estimated fair values. Stock-based compensation expense, calculated using the Black-Scholes option-pricing model for employee stock options, and included in selling, general and administrative expense, was $3.5 million for the three months ended June 30, 2015, and $3.8 million for the three months ended June 30, 2014. Stock-based compensation expense, included in selling, general and administrative expense, for the six months ended June 30, 2015, was $7.2 million and for the six months ended June 30, 2014, was $7.1 million.

As of June 30, 2015

, there was $21.4 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements to be recognized over a weighted-average period of 2.8 years.