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Note 13 - Employee Stock Plans | 6 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] |
13. | Employee Stock Plans
​ Equity compensation awards may be granted to certain eligible employees or non-employee directors. A detailed description of the Company's employee stock plans is included in the Company's 2024 Annual Report on Form 10-K. The Company incurred $530 and $2,143 in the three months ended June 30, 2025 and 2024, respectively, in additional expense for employees who meet the thresholds of the stock plan's retirement provision. The Company incurred $688 and $2,457 in the six months ended June 30, 2025 and 2024, respectively, in additional expense for employees who meet the thresholds of the stock plan's retirement provision. The Company recognized $224 and ($323) of compensation expense related to performance share unit awards in the three months ended June 30, 2025 and 2024, respectively. The Company recognized $785 and ($1,392) of compensation expense related to the performance share unit awards in the six months ended June 30, 2025 and 2024, respectively. The unrecognized compensation expense calculated under the fair value method for performance share units that were, as of June 30, 2025, expected to be earned through the requisite service period was approximately $1,070 and is expected to be recognized through 2028. For the first tranche of the 2025 performance share grants, a Monte Carlo simulation has been used to account for the Total Shareholder Return ("TSR") market condition in the grant date fair value of the award, which was $29.13 or $29.39 per share, depending on the grant date. For the second tranche of the 2024 performance share grants, a Monte Carlo simulation has been used to account for the TSR market condition in the grant date fair value of the award, which was $26.16 per share. A summary of restricted stock unit activity for the six months ended June 30, 2025 is as follows: ​
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  | Weighted |  |  | Average |
|  |  |  |  |  | Average |  |  | Remaining |
|  |  |  |  |  | Grant Date |  |  | Contractual |
|  | Shares |  |  | Fair value |  |  | Term (in years) |
Unvested at December 31, 2024 |  |  | 374,338 |  |  | $ | 28.02 |  |  |  | 1.74 |
Granted |  |  | 180,845 |  |  | $ | 27.27 |  |  |  | 2.03 |
Vested |  |  | (185,119 | ) |  | $ | 29.46 |  |  |  | - |
Cancelled and forfeited |  |  | (5,206 | ) |  | $ | 27.00 |  |  |  | - |
Unvested at June 30, 2025 |  |  | 364,858 |  |  | $ | 26.94 |  |  |  | 1.86 |
Expected to vest in the future at June 30, 2025 |  |  | 354,368 |  |  | $ | 26.94 |  |  |  | 1.86 |
​ The Company recognized $1,330 and $2,801 of compensation expense related to the restricted stock unit awards in the three months ended June 30, 2025 and 2024, respectively. The Company recognized $2,919 and $4,225 of compensation expense related to the restricted stock unit awards in the six months ended June 30, 2025 and 2024, respectively. The unrecognized compensation expense calculated under the fair value method for restricted shares that were, as of June 30, 2025, expected to be earned through the requisite service period was approximately $5,681 and is expected to be recognized through 2028. ​

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