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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
(In Thousands) |  | December 31, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Properties and equipment: |  |  |  |  |  |  |  |
Vessels and related equipment |  | $ | 1,716,339 |  |  | $ | 1,070,821 |
Other properties and equipment |  |  | 32,447 |  |  |  | 35,819 |
|  |  | 1,748,786 |  |  |  | 1,106,640 |
Less accumulated depreciation and amortization |  |  | 433,664 |  |  |  | 309,985 |
Net properties and equipment |  | $ | 1,315,122 |  |  | $ | 796,655 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In Thousands, except per share data) |  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Net income (loss) available to common stockholders |  | $ | 97,185 |  |  | $ | (21,749 | ) |  | $ | (128,969 | )
Weighted average outstanding shares of common stock, basic |  |  | 51,591 |  |  |  | 44,132 |  |  |  | 41,009 |
Dilutive effect of options, warrants and stock awards |  |  | 1,346 |  |  |  | — |  |  |  | — |
Weighted average common stock and equivalents |  |  | 52,937 |  |  |  | 44,132 |  |  |  | 41,009 |
Income (loss) per share, basic |  | $ | 1.88 |  |  | $ | (0.49 | ) |  | $ | (3.14 | )
Income (loss) per share, diluted |  | $ | 1.84 |  |  | $ | (0.49 | ) |  | $ | (3.14 | )
Additional information: |  |  |  |  |  |  |  |  |  |  |  |
Incremental "in-the-money" options, warrants, and restricted stock units outstanding at the end of the period (A) |  |  | 1,674 |  |  |  | 1,863 |  |  |  | 2,346 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Trade |
(In Thousands) |  | and |
|  | Other Receivables |
Balance at January 1, 2021 |  | $ | 73,316 |
Current period provision for expected credit losses |  |  | 1,238 |
Write offs |  |  | (406 | )
Other |  |  | 256 |
Balance at December 31, 2022 |  | $ | 74,404 |
Current period provision for expected credit losses |  |  | 414 |
Acquisition of Sonatide joint venture |  |  | (59,678 | )
Other |  |  | (1,080 | )
Balance at December 31, 2022 |  | $ | 14,060 |
Current period provision for expected credit losses |  |  | 3,305 |
Write offs |  |  | (1,484 | )
Recoveries |  |  | 490 |
Other |  |  | (457 | )
Balance at December 31, 2023 |  | $ | 15,914 |

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