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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
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Common stock, shares outstanding (in shares) |  | 42,029,882 | 41,307,617 | 41,000,575
Total (in shares) |  | 52,461,717 |  | 43,933,165
Restricted Stock Units and Stock Options [Member] |  |  |  |
Common stock shares reserved (in shares) |  | 1,627,083 |  | 1,623,635
New Creditor Warrants [Member] |  |  |  |
Common stock shares reserved (in shares) |  | 395,401 |  | 639,354
GulfMark Creditor Warrants [Member] |  |  |  |
Common stock shares reserved (in shares) |  | 309,351 |  | 669,601
SPO Acquisition Warrants [Member] |  |  |  |
Common stock shares reserved (in shares) | [1] | 8,100,000 |  | 0
[1] | The Share Purchase Agreement for SPO included a provision under which the former parent of SPO agreed to indemnify us for certain liabilities and could settle these liabilities, at their option, with cash or SPO acquisition warrants. This provision caused the SPO acquisition warrants to be classified as liabilities which requires a mark to market valuation primarily based on the change in our share price at each reporting period. Absent this provision, the SPO acquisition warrants would have been classified as equity in our balance sheet with the value included in additional paid in capital. On June 24, 2022, we amended the Share Purchase Agreement revising the provision to require our consent to use the warrants to satisfy any indemnity liabilities. We recognized a loss associated with the mark to market adjustment on June 24, 2022 totaling $14.2 million based on the share price of $21.83 per share on June 24, 2022 compared to the Merger Date share price of $20.08 per share. The SPO acquisition warrants were reclassified from liabilities to additional paid in capital at the adjusted amount of $176.8 million.

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