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Note 4 - Stock Options and Restricted Stock Awards | 9 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 4 – Stock Options and Restricted Stock Awards Valuation and Expense Information 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 the Company’s employees and directors, including employee stock options, restricted stock 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 $6.3 million for the three months ended September 30, 2023, and $3.6 million for the three months ended September 30, 2022. Stock-based compensation expense was $25.3 million for the nine months ended September 30, 2023, and $21.5 million for the nine months ended September 30, 2022. As of September 30, 2023, the Company had $13.4 million of unrecognized compensation expense related to non-vested employee stock options to be recognized over a weighted-average period of 2.3 years and $15.6 million of unrecognized compensation cost related to non-vested restricted stock awards to be recognized over a weighted-average period of 1.4 years.

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