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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, 2021
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
(In Thousands) |  | December 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Properties and equipment: |  |  |  |  |  |  |  |
Vessels and related equipment |  | $ | 898,649 |  |  | $ | 940,175 |
Other properties and equipment |  |  | 19,625 |  |  |  | 16,861 |
|  |  | 918,274 |  |  |  | 957,036 |
Less accumulated depreciation and amortization |  |  | 230,234 |  |  |  | 176,718 |
Net properties and equipment |  | $ | 688,040 |  |  | $ | 780,318 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In Thousands, except share and per share data) |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net loss available to common shareholders |  | $ | (128,969 | ) |  | $ | (196,242 | ) |  | $ | (141,743 | )
Weighted average outstanding shares of common stock, basic |  |  | 41,008,907 |  |  |  | 40,354,638 |  |  |  | 38,204,934 |
Dilutive effect of options, warrants and stock awards |  |  | — |  |  |  | — |  |  |  | — |
Weighted average common stock and equivalents |  |  | 41,008,907 |  |  |  | 40,354,638 |  |  |  | 38,204,934 |
Loss per share, basic |  | $ | (3.14 | ) |  | $ | (4.86 | ) |  | $ | (3.71 | )
Loss per share, diluted |  | $ | (3.14 | ) |  | $ | (4.86 | ) |  | $ | (3.71 | )
Additional information: |  |  |  |  |  |  |  |  |  |  |  |
Incremental "in-the-money" options, warrants, and restricted stock awards and units outstanding at the end of the period (A) |  |  | 2,345,948 |  |  |  | 2,235,310 |  |  |  | 2,483,956 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Trade |  |  | Due |
(In Thousands) |  | and |  |  | from |
|  | Other Receivables |  |  | Affiliate |
Balance at January 1, 2020 |  | $ | 70 |  |  | $ | 20,083 |
Cumulative effect adjustment upon adoption of standard |  |  | 163 |  |  |  | — |
Current period provision for expected credit losses |  |  | 1,283 |  |  |  | 52,981 |
Other |  |  | — |  |  |  | (1,264 | )
Balance at December 31, 2020 |  | $ | 1,516 |  |  | $ | 71,800 |
Current period provision for expected credit losses |  |  | 838 |  |  |  | 400 |
Write offs |  |  | (406 | ) |  |  | — |
Other |  |  | — |  |  |  | 256 |
Balance at December 31, 2021 |  | $ | 1,948 |  |  | $ | 72,456 |

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