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Note 10 - Stock-based Compensation and Incentive Plans | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Share-based Payment Arrangement [Text Block] | (10) STOCK-BASED COMPENSATION AND INCENTIVE PLANS Our long-term incentive plans have included restricted stock units (RSUs), stock options and phantom stock. As of December 31, 2020, the Tidewater Inc. 2017 Stock Incentive Plan (the “2017 Plan”) and the GulfMark Management Incentive Plan (“Legacy GLF Plan”) are our only two active equity incentive plans and the only types of awards outstanding under either plan are RSUs and stock options that settle in shares of Tidewater common stock. The number of common stock shares reserved for issuance under the plans and the number of shares available for future grants are as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Shares of common stock reserved for issuance under the plans |  |  | 3,973,228 |  |  |  | 3,973,228 |  |  |  | 3,973,228 |
Shares of common stock available for future grants |  |  | 1,591,577 |  |  |  | 2,187,101 |  |  |  | 2,325,102 |
Restricted Stock Units We have granted RSUs to key employees, including officers and non-employee directors. We have generally awarded time-based units, where each unit represents the right to receive, at the end of a vesting period, one unrestricted share of Tidewater common stock with no exercise price. We have also awarded performance-based RSUs, where each unit represents the right to receive, at the end of a vesting period, up to two shares of Tidewater common stock with no exercise price based on various operating and financial metrics. The fair value of the performance-based and time-based RSUs is based on the market price of our common stock on the date of grant. The restrictions on the time-based RSUs awarded to key employees lapse over a three-year period from the date of the award. The restrictions on the time-based RSUs awarded to non-employee directors lapse over a one-year period. Time-based RSUs require no goals to be achieved other than the passage of time and continued employment. The restrictions on the performance-based restricted stock units lapse if we meet specific targets as defined. During the restricted period, the RSUs may not be transferred or encumbered, but the recipient has the right to receive dividend equivalents on the restricted stock units, and there are no voting rights until the restricted stock units vest. If dividends are declared, dividend equivalents are accrued on performance-based restricted shares and ultimately paid only if the performance criteria are achieved. RSU compensation costs are recognized on a straight-line basis over the vesting period, and are net of forfeitures. RSUs granted to officers and employees under the 2017 Incentive Plan generally have a vesting period over three years in equal installments from the date of grant, except that (i) the RSUs granted to directors vest over one year and (ii) certain RSUs granted to our officers are performance based and vest on the third anniversary of the date of grant, based on our performance as measured. The following table sets forth a summary of our restricted stock unit activity:
|  | Weighted-average |  |  | Time |  |  | Weight-average |  |  |  |  |
|  | Grant-Date |  |  | Based |  |  | Grant Date |  |  | Performance |
|  | Fair Value |  |  | Units |  |  | Fair Value |  |  | Based Units |
Non-vested balance at December 31, 2017 |  |  | 24.41 |  |  |  | 1,157,646 |  |  |  | — |  |  |  | — |
Granted |  |  | 24.58 |  |  |  | 455,063 |  |  |  | 26.04 |  |  |  | 63,365 |
Vested |  |  | 24.84 |  |  |  | (503,677 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 27.15 |  |  |  | (27,948 | ) |  |  | — |  |  |  | — |
Non-vested balance at December 31, 2018 |  |  | 24.21 |  |  |  | 1,081,084 |  |  |  | 26.04 |  |  |  | 63,365 |
Granted |  |  | 23.44 |  |  |  | 186,143 |  |  |  | 24.50 |  |  |  | 101,143 |
Vested |  |  | 24.45 |  |  |  | (784,868 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 24.70 |  |  |  | (78,591 | ) |  |  | 24.50 |  |  |  | (70,694 | )
Non-vested balance at December 31, 2019 |  |  | 23.32 |  |  |  | 403,768 |  |  |  | 25.54 |  |  |  | 93,814 |
Granted |  |  | 5.95 |  |  |  | 594,234 |  |  |  | — |  |  |  | — |
Vested |  |  | 24.05 |  |  |  | (265,919 | ) |  |  | 26.04 |  |  |  | (63,365 | )
Non-vested balance at December 31, 2020 |  |  | 8.95 |  |  |  | 732,083 |  |  |  | 24.50 |  |  |  | 30,449 |
Restrictions on 449,870 time-based units outstanding at December 31, 2020 will lapse during fiscal 2021. Restricted stock unit compensation expense and grant date fair value are as follows:
|  | Year Ended December 31, |
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Grant date fair value of restricted stock units vested |  | $ | 6,395 |  |  | $ | 19,193 |  |  | $ | 12,513 |
Restricted stock unit compensation expense |  |  | 5,117 |  |  |  | 19,603 |  |  |  | 13,406 |
As of December 31, 2020, total unrecognized RSU compensation costs totaled approximately $4.7 million, or $3.7 million net of tax which will be recognized over a weighted average period of two years, compared to $6.3 million, or $5.0 million net of tax, at December 31, 2019 and $22.6 million, $17.1 million, net of tax, at December 31, 2018. No RSU compensation costs were capitalized as part of the costs of an asset. The amount of unrecognized RSU compensation costs will be affected by any future restricted stock unit grants and by the separation of an employee who has received RSUs that are unvested as of their separation date. There were no modifications to the RSUs during the years ended December 31, 2020, 2019 and 2018. Forfeitures are recognized as an adjustment to compensation expense for all RSUs in the same period as the forfeitures occur. Stock Option Plan Tidewater has 344,598 stock options that were granted in 2020 all of which are outstanding as of December 31, 2020. The weighted average exercise price was $6.48, with a weighted average remaining contractual term of 9.3 years. The stock options vest ratably over a three-year period and have a life of ten years. None of the stock options have been forfeited or exercised or are exercisable. As of December 31, 2020, there was $0.9 million of unrecognized compensation costs related to the stock options that is expected to be recognized over a weighted-average period of 2.3 years. Phantom Stock Plan We previously provided a Phantom Stock Plan (PSP) to provide additional incentive compensation to key employees. Participants in the PSP had the right to receive the value of a share of common stock in cash at vesting. Participants had no voting or other rights as a stockholder. The phantom shares generally had a three-year vesting period. No new awards have been issued under the Phantom Stock Plan since 2016. The following table sets forth a summary of our phantom stock activity:
|  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |
|  | average |  |  | Time |  |  | average |  |  |  |  |  |  | average |  |  |  |  |
|  | Grant-Date |  |  | Based |  |  | Grant-Date |  |  | Series A |  |  | Grant-Date |  |  | Series B |
|  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Warrants |  |  | Fair Value |  |  | Warrants |
Non-vested balance at December 31, 2017 |  | $ | 308.24 |  |  |  | 13,526 |  |  |  | 1.00 |  |  |  | 21,934 |  |  |  | 0.98 |  |  |  | 23,712 |
Vested |  |  | 360.14 |  |  |  | (8,223 | ) |  |  | 1.00 |  |  |  | (13,009 | ) |  |  | 0.98 |  |  |  | (14,064 | )
Cancelled |  |  | 240.39 |  |  |  | (786 | ) |  |  | 1.00 |  |  |  | (1,275 | ) |  |  | 0.98 |  |  |  | (1,379 | )
Non-vested balance at December 31, 2018 |  | $ | 226.50 |  |  |  | 4,517 |  |  |  | 1.00 |  |  |  | 7,650 |  |  |  | 2.94 |  |  |  | 8,269 |
Vested |  |  | 226.50 |  |  |  | (4,517 | ) |  |  | 1.00 |  |  |  | (7,650 | ) |  |  | 2.94 |  |  |  | (8,269 | )
Non-vested balance at December 31, 2019 |  | $ | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
The grant date fair value of phantom stock vested was $1.1 million and $3.0 million, respectively, for the years ended December 31, 2019 and 2018. Phantom stock compensation expense was immaterial for both years.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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