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Note 5 - Stock Options and Restricted Stock Awards	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	5 – Stock Options and Restricted S tock Awards The Company accounts for stock-based compensation in accordance with 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 stock unit 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 $5.9 million for the three months ended June 30, 2018, and $3.9 million for the three months ended June 30, 2017. Stock-based compensation expense, included in selling, general and administrative expense, for the six months ended June 30, 2018, was $13.8 million and for the six months ended June 30, 2017, was $8.7 million. In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016 - 09, “ Co mpensation – Stock Compensation , ” (“ASU 2019 - 06” ) which changed the accounting for certain aspects of share-based payments to employees. ASU No. 2016 - 09 requires excess tax benefits and tax deficiencies to be recorded in the income statement when equity awards issued pursuant to the Company’s equity compensation plans vest or are settled. The Company recorded excess tax benefits of $0.2 million in the three months ended June 30, 2018 and $0.9 million in the three months ended June 30, 2017, which was recorded in the Consolidated Statements of Income and Comprehensive Income. The Company recorded excess tax benefits of $0.2 million in the six months ended June 30, 2018 and $2.0 million in the six months ended June 30, 2017, which was recorded in the Consolidated Statements of Income and Comprehensive Income. As of June 30, 2018, the Company had $10.5 million of unrecognized compensation cost related to non-vested employee stock options to be recognized over a weighted-average period of 3.6 years and $9.8 million of unrecognized compensation cost related to non-vested restricted stock units to be recognized over a weighted-average period of 2.3 years.

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- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-URI http://asc.fasb.org/subtopic&trid=2208855

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- References

No definition available.

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