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Stock-based Compensation Plans | 6 Months Ended
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Mar. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-based Compensation Plans | . Stock-based Compensation Plans The Company has stock-based compensation plans approved by its shareholders under which it grants stock options, restricted stock awards, restricted stock units and deferred stock units to officers, directors and key employees. Stock-based compensation expense was reported as follows in the condensed consolidated statements of operations:
| Three Months Ended March 31, |  |  | Six Months Ended March 31, |
(In thousands) | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Product costs | $ | 72 |  |  | $ | 78 |  |  | $ | 139 |  |  | $ | 108 |
Research and development |  | 329 |  |  |  | 296 |  |  |  | 703 |  |  |  | 731 |
Selling, general and administrative |  | 1,381 |  |  |  | 1,345 |  |  |  | 2,905 |  |  |  | 2,560 |
Total | $ | 1,782 |  |  | $ | 1,719 |  |  | $ | 3,747 |  |  | $ | 3,399 |
As of March 31, 2023, unrecognized compensation costs related to non-vested awards totaled approximately $14.3 million, which is expected to be recognized over a weighted average period of approximately 2.5 years. Stock Option Awards T he Company awards stock options to officers, directors and key employees and uses the Black-Scholes option pricing model to determine the fair value of stock options as of the date of each grant. Stock option grant activity was as follows:
| Six Months Ended March 31, |
| 2023 |  |  | 2022 |
Stock option grant activity: |  |  |  |  |
Stock options granted |  | 293,000 |  |  |  | 283,000 |
Weighted average grant date fair value | $ | 15.27 |  |  | $ | 16.36 |
Weighted average exercise price | $ | 35.40 |  |  | $ | 43.72 |
Restricted Stock Awards During the six months ended March 31, 2023 and 2022, the Company awarded 99,000 and 83,000 restricted stock shares, respectively, to certain key employees and officers with a weighted average grant date fair value per share of $36.05 and $43.87, respectively. Restricted Stock is valued based on the market value of the shares as of the date of grant. Restricted Stock Unit Awards During each of the six months ended March 31, 2023 and 2022, the Company awarded 16,000 and 14,000 restricted stock units (“RSUs”) to directors and to key employees in foreign jurisdictions with a weighted average grant date fair value per unit of $31.72 and $42.79, respectively. RSUs are valued based on the market value of the shares as of the date of grant. Employee Stock Purchase Plan Our U.S. employees are eligible to participate in the amended 1999 Employee Stock Purchase Plan (“ESPP”) approved by our shareholders. During the six months ended March 31, 2023 and 2022, 23,000 and 10,000 shares were issued under the ESPP, respectively.

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