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Note 13 - Stock-based Compensation | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | Note 13 – Stock–Based Compensation NHC recognizes stock–based compensation expense for all stock options granted over the requisite service period using the fair value at the date of grant using the Black–Scholes pricing model. Stock–based compensation totaled $793,000 and $639,000 for the three months ended March 31, 2024 and 2023, respectively. Stock–based compensation is included in “Salaries, wages and benefits” in the interim condensed consolidated statements of operations. At March 31, 2024, the Company had $7,652,000 of unrecognized compensation cost related to unvested stock–based compensation awards. This unrecognized compensation cost will be amortized over an approximate three-year period. Stock Options The following table summarizes the significant assumptions used to value the options granted for the three months ended March 31, 2024 and for the year ended December 31, 2023.
|  | March 31, 2024 |  |  | December 31, 2023 |
Risk–free interest rate |  |  | 4.33% |  |  |  | 4.52% |
Expected volatility |  |  | 24.1% |  |  |  | 29.3% |
Expected life, in years |  |  | 2.9 |  |  |  | 2.9 |
Expected dividend yield |  |  | 2.64% |  |  |  | 4.41% |
The following table summarizes our outstanding stock options for the three months ended March 31, 2024 and for the year ended December 31, 2023.
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2023 |  |  | 445,144 |  |  | $ | 66.62 |  |  | $ | – |
Options granted |  |  | 299,278 |  |  |  | 54.44 |  |  |  | – |
Options exercised |  |  | (103,481 | ) |  |  | 64.72 |  |  |  | – |
Options cancelled |  |  | (52,407 | ) |  |  | 60.58 |  |  |  | – |
Options outstanding at December 31, 2023 |  |  | 588,534 |  |  |  | 61.30 |  |  |  | – |
Options granted |  |  | 245,726 |  |  |  | 94.07 |  |  |  | – |
Options exercised |  |  | (137,874 | ) |  |  | 60.95 |  |  |  | – |
Options outstanding at March 31, 2024 |  |  | 696,386 |  |  | $ | 72.93 |  |  | $ | 15,025,015 |
Options exercisable at March 31, 2024 |  |  | 174,105 |  |  | $ | 68.48 |  |  | $ | 4,531,876 |
Options Outstanding March 31, 2024 |  |  | Exercise Prices |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life in Years |
377,405 |  |  | 53.94 | - | 69.19 |  |  | 58.92 |  |  |  | 3.5 |
318,981 |  |  | 71.64 | - | 94.10 |  |  | 89.51 |  |  |  | 4.0 |
696,386 |  |  |  |  |  |  |  | 72.93 |  |  |  | 3.7 |

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