Tidewater (TDW) 10-K 9 Mar 22 2021 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0000098222
Entity Registrant Name	TIDEWATER INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	1-6311
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	72-0487776
Entity Address, Address Line One	842 West Sam Houston Parkway North, Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77024
City Area Code	713
Local Phone Number	470-5300
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 468,100,000
Entity Common Stock, Shares Outstanding		41,322,217
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Houston, Texas
Auditor Firm ID	238
ICFR Auditor Attestation Flag	true
Deloitte & Touche [Member]
Document Information [Line Items]
Auditor Name	Deloitte & Touche
Auditor Location	Houston, Texas
Auditor Firm ID	34
Warrants to Purchase Shares of Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase shares of common stock
Trading Symbol	TDW.WS
Security Exchange Name	NYSE
Series B Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Series B Warrants to purchase shares of common stock
Trading Symbol	TDW.WS.B
Security Exchange Name	NYSE
Series A Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Series A Warrants to purchase shares of common stock
Trading Symbol	TDW.WS.A
Security Exchange Name	NYSE
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	TDW
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 149,037	$ 149,933
Restricted cash	1,240	2,079
Trade and other receivables, less allowance for credit losses of $1,948 and $1,516 as of December 31, 2021 and 2020, respectively	86,503	112,623
Due from affiliate, less allowance for credit losses of $72,456 and $71,800 as of December 31, 2021 and 2020, respectively	70,134	62,050
Marine operating supplies	12,606	15,876
Assets held for sale	14,421	34,396
Prepaid expenses and other current assets	8,731	11,692
Total current assets	342,672	388,649
Net properties and equipment	688,040	780,318
Deferred drydocking and survey costs	40,734	56,468
Other assets	24,334	25,742
Total assets	1,095,780	1,251,177
Current liabilities:
Accounts payable	20,788	16,981
Accrued expenses	51,734	52,422
Due to affiliate	61,555	53,194
Current portion of long-term debt	0	27,797
Other current liabilities	23,865	32,785
Total current liabilities	157,942	183,179
Long-term debt	167,885	164,934
Other liabilities	68,184	79,792
Commitments and contingencies
Equity:
Common stock of $0.001 par value, 125,000,000 shares authorized. 41,307,617 and 40,704,984 shares issued and outstanding at December 31, 2021 and 2020, respectively	41	41
Additional paid-in capital	1,376,494	1,371,809
Accumulated deficit	(677,900)	(548,931)
Accumulated other comprehensive income (loss)	2,668	(804)
Total stockholders’ equity	701,303	822,115
Noncontrolling interests	466	1,157
Total equity	701,769	823,272
Total liabilities and equity	$ 1,095,780	$ 1,251,177

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance for credit losses	$ 72,456	$ 71,800
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	125,000,000	125,000,000
Common stock, shares issued (in shares)	41,307,617	40,704,984
Common stock, shares outstanding (in shares)	41,307,617	40,704,984
Trade Accounts Receivable [Member]
Allowance for credit losses	$ 1,948	$ 1,516

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenue	$ 371,033	$ 397,038	$ 486,549
Costs and expenses:
Vessel operating costs	261,814	268,780	329,196
Costs of other operating revenues	2,231	3,405	2,800
General and administrative	68,516	73,447	103,716
Depreciation and amortization	114,544	116,709	101,931
(Gain) loss on asset dispositions, net	2,901	(7,591)	(2,263)
Affiliate credit loss impairment expense	400	52,981	0
Affiliate guarantee obligation	0	2,000	0
Long-lived asset impairments and other	15,643	74,109	37,773
Total costs and expenses	466,049	583,840	573,153
Operating loss	(95,016)	(186,802)	(86,604)
Other income (expense):
Foreign exchange loss	(369)	(5,245)	(1,269)
Equity in net earnings (losses) of unconsolidated companies	(3,322)	164	(3,152)
Dividend income from unconsolidated company	0	17,150	0
Interest income and other, net	1,605	1,228	6,598
Loss on early extinguishment of debt	(11,100)	0	0
Interest and other debt costs, net	(15,583)	(24,156)	(29,068)
Total other expense	(28,769)	(10,859)	(26,891)
Loss before income taxes	(123,785)	(197,661)	(113,495)
Income tax (benefit) expense	5,875	(965)	27,724
Net loss	(129,660)	(196,696)	(141,219)
Less: Net income (losses) attributable to noncontrolling interests	(691)	(454)	524
Net loss attributable to Tidewater Inc.	$ (128,969)	$ (196,242)	$ (141,743)
Basic loss per common share (in dollars per share)	$ (3.14)	$ (4.86)	$ (3.71)
Diluted loss per common share (in dollars per share)	$ (3.14)	$ (4.86)	$ (3.71)
Weighted average common shares outstanding (in shares)	41,008,907	40,354,638	38,204,934
Dilutive effect of stock options and restricted stock (in shares)	0	0	0
Adjusted weighted average common shares (in shares)	41,008,907	40,354,638	38,204,934
Vessel [Member]
Revenues:
Revenue	$ 361,569	$ 386,174	$ 477,015
Product and Service, Other [Member]
Revenues:
Revenue	$ 9,464	$ 10,864	$ 9,534

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net loss	$ (129,660)	$ (196,696)	$ (141,219)
Other comprehensive income (loss):
Change in supplemental executive retirement plan pension liability, net of tax of $0, $0, and $0, respectively	(763)	(2,309)	(2,121)
Change in pension plan minimum liability, net of tax of $0, $0, and $0, respectively	4,235	1,741	(309)
Total comprehensive loss	$ (126,188)	$ (197,264)	$ (143,649)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Loss (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in supplemental executive retirement plan pension liability, tax	$ 0	$ 0	$ 0
Change in pension plan and supplemental pension plan liability, tax	$ 0	$ 0	$ 0

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at December 31 at Dec. 31, 2018							$ 37	$ 1,352,388	$ (210,783)	$ 2,194	$ 1,087	$ 1,144,923
Total comprehensive income (loss)							0	0	(141,743)	(2,430)	524	(143,649)
Issuance of common stock							3	(3)	0	0	0	0
Amortization of share based awards							0	15,136	0	0	0	15,136
Balance at December 31 at Dec. 31, 2019	$ 0	$ 0	$ (163)	$ 0	$ 0	$ (163)	40	1,367,521	(352,526)	(236)	1,611	1,016,410
Total comprehensive income (loss)							0	0	(196,242)	(568)	(454)	(197,264)
Issuance of common stock							1	(1)	0	0	0	0
Amortization of share based awards							0	4,289	0	0	0	4,289
Balance at December 31 at Dec. 31, 2020							41	1,371,809	(548,931)	(804)	1,157	823,272
Total comprehensive income (loss)							0	0	(128,969)	3,472	(691)	(126,188)
Amortization of share based awards							0	4,685	0	0	0	4,685
Balance at December 31 at Dec. 31, 2021							$ 41	$ 1,376,494	$ (677,900)	$ 2,668	$ 466	$ 701,769

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net loss	$ (129,660)	$ (196,696)	$ (141,219)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	73,223	73,030	77,045
Amortization of deferred drydocking and survey costs	41,321	43,679	24,886
Amortization of debt premiums and discounts	3,171	3,961	(4,877)
Provision (benefit) for deferred income taxes	(1,287)	1,224	672
(Gain) loss on asset dispositions, net	2,901	(7,591)	(2,263)
Affiliate credit loss impairment expense	400	52,981	0
Affiliate guarantee obligation	0	2,000	0
Long-lived asset impairments and other	15,643	74,109	37,773
Loss on debt extinguishment	11,100	0	0
Changes in investments in unconsolidated companies	0	0	1,039
Stock-based compensation expense	5,638	5,117	19,603
Changes in operating assets and liabilities, net:
Trade and other receivables	26,120	(2,606)	1,086
Changes in due to/from affiliate, net	(123)	11,949	22,193
Marine operating supplies	1,365	2,588	2,425
Other current assets	2,961	4,264	(4,120)
Accounts payable	3,807	(10,520)	(4,438)
Accrued expenses	(688)	(17,551)	8,189
Other current liabilities	(8,920)	8,685	3,008
Other liabilities and deferred credits	(6,849)	(20,002)	1,270
Deferred drydocking and survey costs	(27,282)	(33,271)	(70,437)
Other, net	2,165	8,636	(3,258)
Net cash provided by (used in) operating activities	15,006	3,986	(31,423)
Cash flows from investing activities:
Proceeds from sales of assets	34,010	38,296	28,847
Additions to properties and equipment	(8,951)	(14,900)	(17,998)
Net cash provided by investing activities	25,059	23,396	10,849
Cash flows from financing activities:
Issuance of long-term debt	172,375	0	0
Principal payments on long-term debt	(198,918)	(98,080)	(133,693)
Debt extinguishment premium	(7,781)	0	(11,402)
Debt issuance and modification costs	(5,737)	0	0
Tax on share-based award	(953)	(828)	(4,467)
Other	0	(857)	0
Net cash used in financing activities	(41,014)	(99,765)	(149,562)
Net change in cash, cash equivalents and restricted cash	(949)	(72,383)	(170,136)
Cash, cash equivalents and restricted cash at beginning of period	155,225	227,608	397,744
Cash, cash equivalents and restricted cash at end of period	154,276	155,225	227,608
Supplemental disclosure of cash flow information:
Interest, net of amounts capitalized	13,747	21,235	32,687
Income taxes	$ 19,013	$ 13,018	$ 14,378

Note 1 - Nature of Operations a

Note 1 - Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Business Description and Accounting Policies [Text Block]	1 NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations We provide offshore support vessels and marine support services to the global offshore energy industry through the operation of a diversified fleet of offshore marine service vessels. Our revenues, net earnings and cash flows from operations are dependent upon the activity level of the vessel fleet (utilization) and the price we charge for these services (day-rate). The level of our business activity is driven by the amount of installed offshore oil and gas production facilities, the level of offshore drilling and exploration activity, and the general level of offshore construction projects such as pipeline and windfarm construction and support. Our customers’ offshore activity, in turn, is dependent on crude oil and natural gas prices, which fluctuate depending on the respective levels of supply and demand for crude oil and natural gas and the outlook for such levels. Unless otherwise required by the context, the terms “we”, “us”, “our” and “company” as used herein refer to Tidewater Inc. and its consolidated subsidiaries and predecessors. Basis of Presentation The consolidated financial statements included herein, presented in accordance with United States generally accepted accounting principles and stated in U.S. dollars, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission. Principles of Consolidation The consolidated financial statements include the accounts of Tidewater Inc. and its subsidiaries. Intercompany balances and transactions are eliminated in consolidation. Reporting Segments Reporting business segments are defined as a component of an enterprise for which separate financial information is available and is evaluated by the chief operating decision maker in deciding how to allocate resources and in assessing performance. Our segments are based on geographic markets: the Americas segment, which includes the U.S. Gulf of Mexico (GOM), Trinidad, Mexico and Brazil; the Middle East/Asia Pacific segment, which includes Saudi Arabia, East Africa, Southeast Asia and Australia; the Europe/Mediterranean segment, which includes the United Kingdom, Norway and Egypt; and the West Africa segment, which includes Angola, Nigeria, and other coastal regions of West Africa. Use of Estimates in Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the recorded amounts of revenues and expenses during the reporting period. The accompanying consolidated financial statements include estimates for allowance for credit losses, useful lives of property and equipment, estimated net realizable value of assets held for sale and marine operating supplies, income tax provisions, impairments, commitments and contingencies and certain accrued liabilities. We evaluate our estimates and assumptions on an ongoing basis based on a combination of historical information and various other assumptions that are considered reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not may Cash Equivalents We consider all highly liquid investments with maturities of three Restricted Cash We consider cash as restricted when there are contractual agreements that govern the use or withdrawal of the funds. Marine Operating Supplies Marine operating supplies, which consist primarily of operating parts and supplies for our vessels as well as fuel, are stated at the lower of weighted-average cost or net realizable value. Properties and Equipment Capitalization, Depreciation and Amortization Upon emergence from Chapter 11 July 31, 2017, may no Maintenance and Repairs Most of our vessels require certification inspections twice in every five may Maintenance costs incurred at the time of the recertification drydocking that are not Costs related to vessel improvements that either extend the vessel’s useful life or increase the vessel’s functionality are capitalized and depreciated. Vessel modifications that are performed for a specific customer contract are capitalized and amortized over the firm contract term. Major modifications to equipment that are being performed not Net Properties and Equipment The following are summaries of net properties and equipment: (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 As of December 31, 2021 December 31, 2020 not 7 In the fourth 2021, 2023 two Impairment of Long-Lived Assets We review the vessels in our active fleet for impairment whenever events occur or changes in circumstances indicate that the carrying amount of an asset group may not may We estimate cash flows based upon historical data adjusted for our best estimate of expected future market performance, which, in turn, is based on industry trends. The primary estimates and assumptions used in reviewing active vessel groups for impairment and estimating undiscounted cash flows include utilization rates, average day rates and average daily operating expenses. These estimates are made based on recent actual trends in utilization, day rates and operating costs and reflect management’s best estimate of expected market conditions during the period of future cash flows. These assumptions and estimates have changed considerably as market conditions have changed, and they are reasonably likely to continue to change as market conditions change in the future. Although we believe our assumptions and estimates are reasonable, deviations from the assumptions and estimates could produce materially different results. Management estimates may If an asset group fails the undiscounted cash flow test, we estimate the fair value of that asset group and compare such estimated fair value to the carrying value of that asset group in order to determine if impairment exists. From time to time, we designate assets for disposal. Cost and related accumulated depreciation associated with assets designated for disposal are removed from the property and equipment accounts and reclassified to assets held for sale at estimated net realizable value. Any excess of previous net book value over estimated net realizable value is charged to impairment expense. Refer to Note ( 7 2021 Accrued Property and Liability Losses Our insurance coverage is provided by third Pension Benefits We follow the provisions of Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 715, , December 31 Our pension cost consists of service costs, interest costs, expected returns on plan assets, amortization of prior service costs or benefits and actuarial gains and losses. We consider various factors in developing pension assumptions, including an evaluation of relevant discount rates, expected long-term returns on plan assets, plan asset allocations, expected changes in retirement benefits, analyses of current market conditions and input from actuaries and other consultants. For the long-term rate of return, we developed assumptions regarding the expected rate of return on plan assets based on historical experience and projected long-term investment returns, which consider the plan’s target asset allocation and long-term asset class return expectations. Assumptions for the discount rate reflect the theoretical rate at which liabilities could be settled in the bond market at December 31, 2021 Income Taxes Income taxes are accounted for in accordance with the provisions of ASC 740, Income Taxes not We record uncertain tax positions on the basis of a two 1 not 2 not 50 Revenue Recognition Our primary source of revenue derives from time charter contracts of our vessels on a rate per day of service basis; therefore, vessel revenues are recognized on a daily basis throughout the contract period. The base rate of hire for a time charter contract is generally a fixed rate, provided, however, that some longer-term contracts at times include escalation clauses to recover specific additional costs. Operating Costs Vessel operating costs consist primarily of costs such as crew wages; repair and maintenance; insurance; fuel, lube oil and supplies; and other vessel expenses, which include costs such as brokers’ commissions, training costs, agent fees, port fees, canal transit fees, temporary importation fees, vessel certification fees, and satellite communication fees. Repair and maintenance costs include both routine costs and major repairs carried out during drydockings, which occur during the economic useful life of the vessel. Vessel operating costs are recognized as incurred. Foreign Currency Translation The U.S. dollar is the functional currency for all our existing international operations, as transactions in these operations are predominately denominated in U.S. dollars. Foreign currency exchange gains and losses from the revaluation of our foreign currency denominated monetary assets and liabilities are included in the consolidated statements of operations. Earnings Per Share We report both basic earnings (loss) per share and diluted earnings (loss) per share. The calculation of basic earnings (loss) per share is computed based on the weighted average number of shares of common stock outstanding. Diluted earnings (loss) per share is computed based on the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings (loss) per share includes the dilutive effect of stock options and restricted stock grants (both time and performance based) awarded as part of our share-based compensation and incentive plans as well as our outstanding warrants. Per share amounts disclosed in these Notes to Consolidated Financial Statements, unless otherwise indicated, are on a diluted basis. The components of basic and diluted earnings (loss) per share, are as follows: (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 (A) For years ended December 31, 2021, 2020 2019 Concentrations of Credit Risk Our financial instruments that are exposed to concentrations of credit risk consist primarily of trade and other receivables from a variety of domestic, international and national energy companies. We manage our exposure to risk by performing ongoing credit evaluations of our customers’ financial condition and may 50%. not Stock-Based Compensation Stock-based compensation transactions are accounted for using a fair-value-based method. We use the Black-Scholes option-pricing model to determine the fair-value of stock-based awards. Comprehensive Income (Loss) We report total comprehensive income (loss) and its components. Accumulated other comprehensive income (loss) is comprised of any minimum pension liability for our U.S. Defined Benefits Pension Plans. Fair Value Measurements We follow the provisions of ASC 820, 820 not one Level 1: Level 2: Level 3: not Our primary financial instruments consist of cash and cash equivalents, restricted cash, trade receivables and trade payables with book values that are considered to be representative of their respective fair values. Our cash equivalents, which are securities with maturities less than 90 R ecently Adopted Accounting Pronouncements From time-to-time new accounting pronouncements are issued by the FASB that we adopt as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards, which are not not On August 28, 2018, 2018 13, no 1 2 3 January 1, 2020 not 7 On June 16, 2016, 2016 13, Expected credit losses are recognized on the initial recognition of our trade accounts receivable, contract assets and net amounts due from our less than 50% not five January 1, 2020, first not January 1, 2020 Activity in the allowance for credit losses for the years ended December 31, 2021 2020 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 In 2019, In December 2019, 2019 12, 740 December 15, 2020 January 1, 2021 not In August 2018 2018 14, no December 15, 2020 January 1, 2021 not Recently Issued Accounting Standards Not In November 2021, 2021 10, December 15, 2021, January 1, 2022, In October 2021, 2021 08, 805, 606, December 15, 2022 In July 2021, 2021 05, 842, not 1 December 15, 2021, January 1, 2022, not In May 2021, 2021 04, December 15, 2021, January 1, 2022, not

Note 2 - Revenue Recognition

Note 2 - Revenue Recognition	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	( 2 Our primary source of revenue is derived from charter contracts for which we provide a vessel and crew on a rate per day of service basis. Services provided under respective charter contracts represent a single performance obligation satisfied over time and are comprised of a series of time increments; therefore, vessel revenues are recognized daily throughout the contract period. There are no 30 60 Occasionally, customers pay additional lump-sum fees to us in order to either mobilize a vessel to a new location prior to the start of a charter contract or demobilize the vessel at the end of a charter contract. Mobilizations are not Customers also occasionally reimburse us for modifications to vessels in order to meet contractual requirements. These vessel modifications are not Total revenue is determined for each individual contract by estimating both fixed (mobilization, demobilization and vessel modifications) and variable (day rate services) consideration expected to be earned over the contract term. Costs associated with customer-directed mobilizations and reimbursed modifications to vessels are considered costs of fulfilling a charter contract and are expected to be recovered. Mobilization costs such as crew, travel, fuel, port fees, temporary importation fees and other costs are deferred as an asset and amortized as other vessel operating expenses consistent with the pattern of revenue recognition primarily on a straight-line basis over the term of such vessel’s charter. Costs incurred for modifications to vessels in order to meet contractual requirements are capitalized as a fixed asset and depreciated either over the term of the respective charter contract or over the remaining estimated useful life of the vessel in instances where the modification is a permanent upgrade to the vessel and enhances its usefulness. Refer to Note ( 13 Contract Balances Trade accounts receivables are recognized when revenue is earned and collectible. Contract assets include pre-contract costs, primarily related to vessel mobilizations, which have been deferred and will be amortized as other vessel expenses consistent with the pattern of revenue recognition primarily on a straight-line basis over the term of such vessel’s charter. Contract liabilities include payments received for mobilizations or reimbursable vessel modifications to be recognized consistent with the pattern of revenue recognition primarily on a straight-line basis over the term of such vessel’s charter. At December 31, 2021 , December 31, 2022 . December 31, 2020 December 31, 2021

Note 3 - Debt

Note 3 - Debt	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Debt Disclosure [Text Block]	( 3 DEBT The following table summarizes debt outstanding based on stated maturities: (In Thousands) December 31, December 31, 2021 2020 Senior secured bonds: 8.50 November 2026 $ 175,000 $ — Senior secured notes: 8.00 August 2022 — 147,049 Troms offshore borrowings: NOK denominated notes due May 2024 January 2026 — 20,513 USD denominated notes due January April 2027 — 30,413 175,000 197,975 Debt discount and issuance costs (7,115 ) (5,244 ) Less: Current portion of long-term debt — (27,797 ) Total long-term debt $ 167,885 $ 164,934 Senior Secured Bonds due November 2026 ( 2026 On November 16, 2021, 2026 2022, The 2026 November 15, 2021 ( 2026 The 2026 The 2026 November 16, 2026. 2026 May November May 2022. one sixth December 31, 2021. 2026 2026 May 2024 The 2026 two not first two 2026 As of December 31, 2021 2026 two Credit Facility Agreement On November 16, 2021, The Credit Facility Agreement matures on November 16, 2026 2026 Loans under Credit Facility Agreement will bear interest, at our option, either at a rate based on the prime rate published in the Wall Street Journal, or at LIBOR, plus 4% in either case. LIBOR, which is expected to be discontinued as an interest rate benchmark, is subject to customary provisions for replacement by the secured overnight financing rate as published by the Federal Reserve Bank of New York. The Credit Facility Agreement includes covenants and events of default that are substantially the same as those provided in the Bond Terms, including covenants that limit liens, indebtedness, fundamental changes, dispositions, distributions, third two Senior Secured Notes Upon our emergence from Chapter 11 July 31, 2017, 2022. The Senior Secured Notes were scheduled to mature on August 1, 2022; November 2021 2026 8.00% The $2.1 million restricted cash on the balance sheet at December 31, 2020, 2021 2020, fourth 2020 We completed a successful voluntary tender offer for our Senior Secured Notes in November 2019 Troms Offshore Debt Between 2012 2014 two May 2024 January 2026. 2015 two 2027. December 31, 2020 An amendment and restatement were executed in December 2020 not December 31, 2021 2020, November 2021 2026 Debt Costs We capitalize a portion of our interest costs incurred on borrowed funds used to construct vessels. Interest and debt costs incurred are as follows: (In Thousands) Year Ended December 31, 2021 2020 2019 Total interest and debt costs incurred $ 15,607 $ 24,156 $ 29,068 Less: interest costs capitalized (24 ) — — Total interest and debt costs $ 15,583 $ 24,156 $ 29,068

Note 4 - Investment in Unconsol

Note 4 - Investment in Unconsolidated Affiliates	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Equity Method Investments and Joint Ventures Disclosure [Text Block]	( 4 INVESTMENT IN UNCONSOLIDATED AFFILIATES We maintained the following balances with our unconsolidated affiliates: (In Thousands) December 31, December 31, 2021 2020 Due from affiliates: Angolan joint venture (Sonatide) $ 49,011 $ 41,623 Nigerian joint venture (DTDW) 21,123 20,427 70,134 62,050 Due to affiliates: Sonatide $ 40,432 $ 32,767 DTDW 21,123 20,427 61,555 53,194 Due from affiliates, net of due to affiliates $ 8,579 $ 8,856 Amounts due from Sonatide Amounts due from Sonatide (Due from affiliate in the consolidated balance sheets) at December 31, 2021 December 31, 2020 (In Thousands) Year Ended December 31, 2021 2020 2019 Due from Sonatide at beginning of year $ 41,623 $ 89,246 $ 109,176 Revenue earned by the company through Sonatide 41,775 44,254 52,372 Less amounts received from Sonatide (26,429 ) (36,160 ) (60,486 ) Less amounts used to offset Due to Sonatide obligations (A) (8,530 ) (11,848 ) (10,551 ) Less impairment of due from affiliate (400 ) (40,900 ) — Other 972 (2,969 ) (1,265 ) $ 49,011 $ 41,623 $ 89,246 (A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture. The obligation to us from Sonatide is denominated in U.S. dollars; however, the underlying third 2019, January 2022, 15 In the second 2020 June 22, 2020, At December 31, 2021, December 31, 2021 2020, Amounts due to Sonatide Amounts due to Sonatide (Due to affiliate in the consolidated balance sheets) at December 31, 2021 2020 (In Thousands) Year Ended December 31, 2021 2020 2019 Due to Sonatide at beginning of year $ 32,767 $ 31,475 $ 29,347 Plus commissions payable to Sonatide 3,832 4,152 4,937 Plus amounts paid by Sonatide on behalf of the company 10,914 9,037 9,654 Less commissions paid to Sonatide — — (5,961 ) Less amounts used to offset Due from Sonatide obligations (A) (8,530 ) (11,848 ) (10,551 ) Other 1,449 (49 ) 4,049 $ 40,432 $ 32,767 $ 31,475 (A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture. Sonatide Operations Sonatide’s principal earnings are from the commissions paid by us to the joint venture for our vessels chartered into Angola. In addition, Sonatide owns two may Company operations in Angola For the year ended December 31, 2021 December 31, 2021 For the year ended December 31, 2020 December 31, 2020 For the year ended December 31, 2019 December 31, 2019 Amounts due from DTDW We own 40% of DTDW in Nigeria. Our partner, who owns 60%, is a Nigerian national. DTDW owns one offshore service vessel. We also operate company owned vessels in Nigeria for which the joint venture receives a commission. As of December 31, 2021 2020, no not 2020 second 2020 19 7 2020. not December 31, 2020 As of December 31, 2020, December 31, 2020. April 22, 2021,

Note 5 - Income Taxes

Note 5 - Income Taxes	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	( 5 INCOME TAXES Losses before income taxes derived from United States and non-U.S. operations are as follows: (In Thousands) Year Ended December 31, 2021 2020 2019 Non-U.S. $ (58,476 ) $ (137,225 ) $ (44,205 ) United States (65,309 ) (60,436 ) (69,290 ) $ (123,785 ) $ (197,661 ) $ (113,495 ) Income tax expense (benefit) consists of the following: (In Thousands) U.S. Federal State Non-U.S. Total Year Ended December 31, 2019 Current $ 649 $ — $ 26,403 $ 27,052 Deferred 672 — — 672 $ 1,321 $ — $ 26,403 $ 27,724 Year Ended December 31, 2020 Current $ (21,005 ) $ — $ 18,816 $ (2,189 ) Deferred (30 ) — 1,254 1,224 $ (21,035 ) $ — $ 20,070 $ (965 ) Year Ended December 31, 2021 Current $ 682 $ — $ 6,480 $ 7,162 Deferred (1,418 ) — 131 (1,287 ) $ (736 ) $ — $ 6,611 $ 5,875 The actual income tax expense above differs from the amounts computed by applying the U.S. federal statutory tax rate of 21% to pre-tax loss as a result of the following: (In Thousands) Year Ended December 31, 2021 2020 2019 Computed “expected” tax benefit $ (25,995 ) $ (41,509 ) $ (23,834 ) Increase (reduction) resulting from: Foreign income taxed at different rates 10,984 27,639 9,283 Uncertain tax positions (25,417 ) (62,833 ) 5,145 Valuation allowance - deferred tax assets 34,566 43,455 15,707 Valuation allowance - deferred tax true-up 29,711 (6,523 ) — Deferred tax true-up (29,789 ) 6,523 — Foreign taxes 15,220 12,520 20,778 Return to accrual (7,691 ) 11,401 (2,247 ) 162(m) - Executive compensation 125 286 28 Subpart F income 484 5,631 1,227 Other, net 3,677 2,445 1,637 $ 5,875 $ (965 ) $ 27,724 The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows: (In Thousands) December 31, December 31, 2021 2020 Deferred tax assets: Accrued employee benefit plan costs $ 7,275 $ 8,815 Stock based compensation 649 407 Net operating loss and tax credit carryforwards 215,797 148,699 Restructuring fees not currently deductible for tax purposes 566 1,415 Disallowed business interest expense carryforward 10,386 5,546 Other 3,152 2,518 Gross deferred tax assets 237,825 167,400 Less valuation allowance (204,899 ) (140,428 ) Net deferred tax assets 32,926 26,972 Deferred tax liabilities: Depreciation and amortization (31,745 ) (25,883 ) Outside basis difference deferred tax liability (2,891 ) (2,891 ) Foreign interest withholding tax (990 ) (859 ) Other 572 (754 ) Gross deferred tax liabilities (35,054 ) (30,387 ) Net deferred tax assets (liabilities) $ (2,128 ) $ (3,415 ) On March 27, 2020, not 1 2019 2020 five five 2 2019 2020 80% 2020 3 4 December 31, 2020 As of December 31, 2021 382 December 31, 2020 382 December 31, 2021 2025 IRC Sections 382 383 11 2017 382. 2018 382. 2032. not not Management assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit the use of the existing deferred tax assets. A significant piece of objective negative evidence evaluated, were the cumulative losses for financial reporting purposes that were incurred for the years ending December 31, 2021 2020 2019 Based on this evaluation, for the period ended December 31, 2021 December 31, 2020 no We have not not 2017 2017 not Historically, it has been the practice and intention of the Company to indefinitely reinvest the earnings of its non-U.S. subsidiaries. Considering the significant changes made by the Tax Act, the Company will no no December 31, 2021 not We record uncertain tax positions on the basis of a two 1 not 2 not 50 Our balance sheet reflects the following in accordance with ASC 740: (In Thousands) December 31, December 31, 2021 2020 Tax liabilities for uncertain tax positions $ 29,283 $ 35,304 Income tax payable 11,480 15,928 Income tax receivable 1,322 8,280 Included in the liability balances for uncertain tax positions above for the periods ending December 31, 2021 2020 A reconciliation of the beginning and ending amount of all unrecognized tax benefits, and the liability for uncertain tax positions (but excluding related penalties and interest) are as follows: (In Thousands) Balance at December 31, 2018 $ 399,292 Additions based on tax positions related to the current year 14,741 Additions based on tax positions related to a prior year 1,964 Settlement and lapse of statute of limitations (1,897 ) Reductions based on tax positions related to a prior year (58 ) Balance at December 31, 2019 (A) $ 414,042 Additions based on tax positions related to a prior year 2,223 Settlement and lapse of statute of limitations (64,458 ) Reductions based on tax positions related to a prior year (760 ) Balance at December 31, 2020 (A) $ 351,047 Additions based on tax positions related to the current year 53 Additions based on tax positions related to a prior year 18,515 Settlement and lapse of statute of limitations (35,962 ) Balance at December 31, 2021 (A) $ 333,653 (A) The gross balance reported as uncertain tax positions is largely offset by $322.1 million of foreign tax credits and other tax attributes. It is reasonably possible that a decrease of $6.4 million in unrecognized tax benefits may The amount of unrecognized tax benefits that, if recognized for tax purposes, would affect the effective tax rate are $29.3 million and $35.3 million as of December 31, 2021 December 31, 2020 With limited exceptions, we are no March 2015. October 2020, December 31, 2017 December 31, 2017 November 15, 2021 no not The Tax Act The Tax Act was enacted on December 22, 2017 35% 21% January 1, 2018, one The Tax Act subjects a US shareholder to tax on GILTI earned by certain foreign subsidiaries. We have made an accounting policy election to account for GILTI in the year the tax is incurred. Due to current year losses, no December 31, 2021 2020 2019 The BEAT provisions in the Tax Act eliminate the deduction of certain base-erosion payments made to related foreign corporations beginning in 2018, not December 31, 2021 2020 2019

Note 6 - Leases

Note 6 - Leases	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	( 6 We have operating leases primarily for office space, temporary residences, automobiles and office equipment. Contracts containing assets that we benefit from and control are recognized on our balance sheet. Leases with an initial term of 12 not one one ten not not not December 31, 2021 2020 Leases (In Thousands) Classification December 31, 2021 December 31, 2020 Assets: Operating Other assets $ 3,441 $ 3,372 Liabilities: Current Operating Other current liabilities 1,405 1,134 Noncurrent Operating Other liabilities 3,301 2,668 Total lease liabilities $ 4,706 $ 3,802 Future payments to be made on our operating lease liabilities at December 31, 2021 Maturity of lease liabilities (In Thousands) Operating leases 2022 $ 2,205 2023 1,183 2024 741 2025 748 2026 680 After 2026 316 Total lease payments 5,873 Less: Interest (1,167 ) Present value of lease liabilities $ 4,706 As most of our leases do not January 1, 2019 Lease costs included in general and administrative expense for the years ended December 31, 2021, 2020 2019, (In Thousands) Year Ended Year Ended Year Ended Lease costs Classification December 31, 2021 December 31, 2020 December 31, 2019 Operating lease costs General and administrative $ 1,369 $ 1,270 $ 1,336 Short-term leases General and administrative 2,529 3,483 4,840 Variable lease costs General and administrative 412 392 313 Sublease income General and administrative — — (3 ) Net lease cost $ 4,310 $ 5,145 $ 6,486 Our weighted average remaining lease term and weighted average discount rate at December 31, 2021 Lease term and discount rate December 31, 2021 Weighted average remaining lease term in years 3.3 Weighted average discount rate 7.4 % The cash paid for operating leases included in operating cash flows and in the measurement of lease liabilities for the years ended December 31, 2021, 2020 2019 December 31, 2021, 2020 2019,

Note 7 - Assets Held for Sale,

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Asset Impairment Charges [Text Block]	( 7 ASSETS HELD FOR SALE, ASSET SALES AND ASSET IMPAIRMENTS In 2019, not first 2020, 2020, 2020, two December 31, 2020. 2020. 2021, December 31, 2021. 2021. third second 2021, December 31, 2021 2020 See the following tables for additions and dispositions related to assets held for sale as well as net gains (losses) on sales of vessels and impairments recorded when the assets were valued at net realizable value upon classification as held for sale. Following is the activity in assets held for sale during the years ended December 31: (In Thousands, except number of vessels) Number of Vessels 2021 Number of Vessels 2020 Number of Vessels 2019 Beginning balance 23 $ 34,396 46 $ 39,287 — $ — Additions 7 18,096 32 97,663 46 66,033 Sales (9 ) (15,433 ) (53 ) (26,877 ) — — Reactivation (3 ) (7,250 ) (2 ) (500 ) — — Impairment — (15,388 ) — (75,177 ) — (26,746 ) Ending balance 18 $ 14,421 23 $ 34,396 46 $ 39,287 Following is the summary of vessel sales and the gains on sales of vessels for the years ended December 31: (In Thousands, except number of vessels) 2021 2020 2019 Vessels sold from active fleet 10 3 40 Gain on sale of active vessels, net $ 3,499 $ 1,217 $ 2,434 Vessels sold from assets held for sale 9 53 — Gain (loss) on vessels sold from assets held for sale, net $ (6,209 ) $ 6,384 $ — Total vessels sold 19 56 40 Total gain (loss) on sales of vessels, net $ (2,710 ) $ 7,601 $ 2,434 During the years ended December 31, 2021, 2020, 2019, 2021, 2020 2021. 2020, 2019 two 2020. 3 third no not In conjunction with our review of conditions that would indicate potential impairment in the value of our assets, we identified certain obsolete marine service parts and supplies inventory and charged $1.9 million, $3.0 December 31, 2021, 2020, 2019. 3 In 2011, not 2019, not, fourth 2019. 2020, fourth 2020 no Impairments incurred during the last three Following is a summary of impairment of vessels in our active fleet, assets held for sale, marine service and vessel supplies and other impairment and costs during the years ended December 31: (In Thousands, except number of vessels) Number of Vessels 2021 Number of Vessels 2020 Number of Vessels 2019 Assets held for sale 8 $ 15,388 47 $ 75,177 35 $ 26,746 Reactivation of asset held for sale 1 (1,650 ) — — — — Obsolete inventory — 1,905 — 2,959 — 5,223 Other — — — (4,027 ) — 5,804 Total impairment and other expense $ 15,643 $ 74,109 $ 37,773 In the first 2020, 19 19 19 2020 2021. 19 March 2020 2020 2021. fourth 2021 19 In the first second 2020, may first two 2020, 1 360, not third 2020, fourth December 31, 2021, not not 1 2021. Please refer to Note ( 1

Note 8 - Employee Retirement Pl

Note 8 - Employee Retirement Plans	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Retirement Benefits [Text Block]	( 8 EMPLOYEE RETIREMENT PLANS Defined Benefit Pension Plan We have a defined benefit pension plan (pension plan) that covers certain U.S. employees. On December 31, 2010, December 31, 2019. not December 31, 2021 2020 may 2022, not 2020. two December 31, 2020. Supplemental Executive Retirement Plan We also offered a non-contributory, defined benefit supplemental executive retirement plan (supplemental plan) that provides pension benefits to certain employees in excess of those allowed under our tax-qualified pension plan. The supplemental plan was closed to new participation in 2010 January 1, 2018. December 31, 2021, 2020 2019 Investment Strategies U.S. Pension Plan The obligations of our pension plan are supported by assets held in a trust for the payment of benefits. We are obligated to adequately fund the trust. For the pension plan assets, we have the following primary investment objectives: ( 1 2 The plan has historically invested in a fixed income only strategy, however because interest rates are forecasted by the United States (U.S.) Federal Reserve to remain low through 2023, 2020 150 500 The fixed income portion of the pension plan investment portfolio will be approximately 50% may not not The cash flow requirements of the pension plan are analyzed at least annually. The plan does not Our policy for the pension plan is to contribute no no December 31, 2021 not 10% U.S. Pension Plan Asset Allocations The following table provides the target and actual asset allocations for the pension plan: Actual as of Actual as of Target December 31, 2021 December 31, 2020 U.S. Pension plan: Cash — % 2 % 3 % Debt securities 50 % 34 % 53 % Equity securities 50 % 64 % 44 % Total 100 % 100 % 100 % Fair Value of Pension Plans Assets Tidewater’s plan assets are accounted for at fair value and are classified within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement, except for investments for which fair value is measured using the net asset value per share expedient. The following table provides the fair value hierarchy for our domestic pension plan measured at fair value as of December 31, 2021 Quoted prices in Significant Significant active observable unobservable Measured at (In Thousands) markets inputs inputs Net Asset Fair Value (Level 1) (Level 2) (Level 3) Value Pension plan measured at fair value: Equity securities, primarily exchange traded funds $ 36,240 $ 36,240 $ — $ — $ — Debt securities, primarily mutual funds 19,628 19,628 — — — Cash and cash equivalents 911 — 911 — — Total fair value of plan assets $ 56,779 $ 55,868 $ 911 $ — $ — The fair value hierarchy for the pension plans assets measured at fair value as of December 31, 2020 Quoted prices in Significant Significant active observable unobservable Measured at (In Thousands) markets inputs inputs Net Asset Fair Value (Level 1) (Level 2) (Level 3) Value Pension plan measured at fair value: Equity securities, primarily exchange traded funds $ 24,947 $ 21,780 $ — $ — $ 3,167 Debt securities, primarily exchange traded funds 29,922 17,925 — — 11,997 Cash and cash equivalents 1,626 — 1,626 — — Total fair value of plan assets $ 56,495 $ 39,705 $ 1,626 $ — $ 15,164 Plan Assets and Obligations Changes in combined plan assets and obligations and the funded status of the U.S. defined benefit pension plan, Norway’s defined benefit pension plan (discontinued in the fourth 2020 (In Thousands) Year Ended December 31, 2021 2020 2019 Change in benefit obligation: Benefit obligation at beginning of the period $ 88,960 $ 91,654 $ 90,247 Service cost — 112 427 Interest cost 2,168 2,907 3,751 Benefits paid (5,693 ) (5,990 ) (5,967 ) Actuarial (gain) loss (A) (1,127 ) 5,277 8,198 Settlement — (4,407 ) (4,978 ) Foreign currency exchange rate changes — (593 ) (24 ) Benefit obligation at end of the period $ 84,308 $ 88,960 $ 91,654 Change in plan assets: Fair value of plan assets at beginning of the period $ 56,495 $ 59,625 $ 56,790 Actual return 4,374 6,890 7,498 Actuarial loss — 18 983 Administrative expenses — (49 ) (68 ) Employer contributions 1,603 1,615 5,027 Benefits paid (5,693 ) (5,990 ) (5,967 ) Settlement — (5,000 ) (4,638 ) Foreign currency exchange rate changes — (614 ) — Fair value of plan assets at end of the period 56,779 56,495 59,625 Unfunded status at end of the period $ (27,529 ) $ (32,465 ) $ (32,029 ) Net amount recognized in the balance sheet consists of: Current liabilities $ (1,578 ) $ (1,524 ) $ (1,422 ) Noncurrent liabilities (25,951 ) (30,941 ) (30,607 ) Net amount recognized $ (27,529 ) $ (32,465 ) $ (32,029 ) (A) The change in the actuarial (gain) loss for the three December 31, 2021 The following table provides combined information for pension plans with an accumulated benefit obligation in excess of plan assets (includes both the pension plans and supplemental plan): (In Thousands) December 31, December 31, 2021 2020 Projected and accumulated benefit obligation $ 84,308 $ 88,960 Fair value of plan assets 56,779 56,495 Net periodic combined benefit cost for the pension plans and the supplemental plan includes the following components: (In Thousands) Year Ended December 31, 2021 2020 2019 Service cost $ — $ 109 $ 427 Interest cost 2,168 2,907 3,751 Expected return on plan assets (2,174 ) (2,191 ) (2,375 ) Administrational expenses — 49 71 Payroll tax of net pension costs — 14 55 Amortization of net actuarial losses 145 (5 ) (592 ) Settlement/curtailment (gain) loss — 738 (219 ) Net periodic pension cost $ 139 $ 1,621 $ 1,118 The components of the net periodic combined pension cost, except for the service costs are included in the caption “Interest income and other, net.” Service costs are included in the caption “Vessel operating costs.” Other changes in combined plan assets and benefit obligations recognized in other comprehensive (income) loss include the following components: Pension Benefits (In Thousands) Year Ended December 31, 2021 2020 2019 Net (gain) loss $ (3,472 ) $ (568 ) $ 2,612 Settlement recognized — — (182 ) Total recognized in other comprehensive (income) loss, before tax and net of tax $ (3,472 ) $ (568 ) $ 2,430 We do not Discount rates of 2.85% and 2.5% were used to determine net benefit obligations as of December 2021 2020 Assumptions used to determine net periodic benefit costs are as follows: Pension Benefits 2021 2020 Discount rate 2.5 % 3.5 % Expected long-term rate of return on assets 4.0 % 4.0 % Rates of annual increase in compensation levels N/A 2.3 % To develop the expected long-term rate of return on assets assumption, we considered the current level of expected returns on various asset classes. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected return on plan assets assumption for the portfolio. Based upon the assumptions used to measure our qualified pension benefit obligations at December 31, 2021 ten Pension Year ending December 31, (In Thousands) Benefits 2022 $ 5,911 2023 5,863 2024 5,816 2025 5,746 2026 5,648 2027 – 2031 26,188 Total 10-year estimated future benefit payments $ 55,172 Defined Contribution Plans Retirement Contributions Prior to 2019, five January 1, 2018. 401 Upon meeting various citizenship, age and service requirements, employees are eligible to participate in a defined contribution savings plan and can contribute from 2% to 75% of their base salary to an employee benefit trust. Effective October 31, 2021, first December 31, 2021, The plan held no shares of Tidewater common stock for the years ended December 31, 2021 2020 Other Plans A non-qualified supplemental savings plan is provided to executive officers who defer additional eligible compensation that cannot be deferred under the existing 401 January 1, 2018. We also provided retirement benefits to our eligible non-U.S. citizen employees working outside their respective country of origin pursuant to a self-directed multinational defined contribution retirement plan provided the employees were not January 1, 2018. Multi-employer Pension Obligations Certain of our current and former U.K. subsidiaries are participating in two December 31, 2021 2020 March 2018 March 2017

Note 9 - Stock-based Compensati

Note 9 - Stock-based Compensation and Incentive Plans	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	( 9 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, 2021 2021 “2021 2017 “2017 three 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, 2021 2020 2019 Shares of common stock reserved for issuance under the plans 6,473,228 3,973,228 3,973,228 Shares of common stock available for future grants 3,037,187 1,591,577 2,187,101 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 no 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 no three one no may not no RSUs granted to officers and employees under all the incentive plans generally have a vesting period over three one third 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, 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 Granted 13.26 452,403 — — Vested 10.97 (406,604 ) — — Cancelled/forfeited 24.50 (1,769 ) — — Non-vested balance at December 31, 2021 $ 10.37 776,113 $ 24.50 30,449 Restrictions on 299,000 time-based units outstanding at December 31, 2021 2022. Restricted stock unit compensation expense and grant date fair value are as follows: (In Thousands) Year Ended December 31, 2021 2020 2019 Grant date fair value of restricted stock units vested $ 4,460 $ 6,395 $ 19,193 Restricted stock unit compensation expense 5,638 5,117 19,603 As of December 31, 2021 two December 31, 2020 December 31, 2019 No no December 31, 2021, 2020 2019 Stock Option Plan Tidewater has 603,756 stock options that were granted in 2020 2021 December 31, 2021 December 31, 2021 three ten None December 31, 2021 Phantom Stock Plan We previously provided a Phantom Stock Plan to provide additional incentive compensation to key employees. Participants had the right to receive the value of a share of common stock in cash at vesting. Participants had no three 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, 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 for the year ended December 31, 2019.

Note 10 - Stockholders' Equity

Note 10 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	( 10 STOCKHOLDERS’ EQUITY Common Stock The number of shares of authorized and issued common stock and preferred stock are as follows: December 31, December 31, 2021 2020 Common stock shares authorized 125,000,000 125,000,000 Common stock par value $ 0.001 $ 0.001 Common stock shares issued 41,307,617 40,704,984 Preferred stock shares authorized 3,000,000 3,000,000 Preferred stock par value No par No par Preferred stock shares issued — — Common Stock Repurchases No shares were repurchased during the years ended December 31, 2021, 2020 2019 Dividend Program There were no dividends declared during the years ended December 31, 2021, 2020 2019 Warrants During 2017, December 31, 2021 In conjunction with the merger with GulfMark, Tidewater assumed approximately 2.3 million $0.01 Creditor Warrants (GLF Creditor Warrants) and approximately 0.8 million Equity Warrants (GLF Equity Warrants) with an exercise price of $100 and each warrant becoming exercisable for 1.1 shares of Tidewater common stock on substantially the same terms and conditions as provided in the warrant agreements governing the GLF Creditor Warrants and the GLF Equity Warrants. As of December 31, 2021 At-the-market offering On November 16, 2021, may The offer and sale of the Shares to be sold pursuant to the Agreement have been registered under the Securities Act of 1933, 3 No. 333 234686 415 The Agreement contains customary representations, warranties and covenants, customary indemnification and contribution obligations, including for certain liabilities under the Securities Act, other obligations of the parties and termination provisions. Under the terms of the Agreement, we will pay the Agents a commission up to 3.0% of the gross proceeds from each sale of the Shares. In addition, we have agreed to pay certain expenses incurred by the Agents in connection with entering into the Agreement and the offering. The Agreement will terminate upon the earlier of (i) such date that the aggregate gross sales proceeds of Shares sold pursuant to the Agreement equal the total dollar amount listed in the Agreement or (ii) the termination of the Agreement by us or an Agent in accordance with the terms of the Agreement. We have no may Shelf Registration On July 13, 2021, 3 July 20, 2021. may one may one may one may Accumulated Other Comprehensive Income (Loss) The changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows: (In Thousands) Year Ended December 31, 2021 2020 2019 Balance at December 31 $ (804 ) $ (236 ) $ 2,194 Pension benefits recognized in OCI 3,472 (568 ) (2,430 ) Balance at December 31 $ 2,668 $ (804 ) $ (236 ) Tax Benefits Preservation Plan On April 13, 2020, 382 December 15, 2021.

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	( 11 COMMITMENTS AND CONTINGENCIES Currency Devaluation and Fluctuation Risk Due to our international operations, we are exposed to foreign currency exchange rate fluctuations and exchange rate risks on all charter hire contracts denominated in foreign currencies. For some of our international contracts, a portion of the revenue and local expenses are incurred in local currencies with the result that we are at risk of changes in the exchange rates between the U.S. dollar and foreign currencies. We generally do not not Legal Proceedings Various legal proceedings and claims are outstanding which arose in the ordinary course of business. In the opinion of management, the amount of ultimate liability, if any, with respect to these actions, will not

Note 12 - Accrued Expenses, Oth

Note 12 - Accrued Expenses, Other Current Liabilities, and Other Liabilities	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Other Assets Accrued Expenses Other Current Liabilities And Other Liabilities And Deferred Credits [Text Block]	( 12 ACCRUED EXPENSES, OTHER CURRENT LIABILITIES, AND OTHER LIABILITIES A summary of accrued expenses as of December 31, (In Thousands) 2021 2020 Payroll and related payables $ 18,627 $ 17,201 Accrued vessel expenses 19,662 17,129 Accrued interest expense 1,859 3,240 Other accrued expenses 11,586 14,852 $ 51,734 $ 52,422 A summary of other current liabilities as of December 31, (In Thousands) 2021 2020 Taxes payable $ 18,977 $ 23,883 Other 4,888 8,902 $ 23,865 $ 32,785 A summary of other liabilities as of December 31, (In Thousands) 2021 2020 Pension liabilities $ 26,872 $ 31,736 Liability for uncertain tax positions 29,283 35,304 Other 12,029 12,752 $ 68,184 $ 79,792

Note 13 - Segment Information,

Note 13 - Segment Information, Geographic Data and Major Customers	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	( 13 SEGMENT INFORMATION, GEOGRAPHICAL DATA AND MAJOR CUSTOMERS The following table provides a comparison of revenues, vessel operating profit (loss), depreciation and amortization, additions to properties and equipment and assets by segment and in total. Vessel operating profit (loss) is calculated as vessel revenues less vessel operating costs, segment depreciation expenses, and segment general and administrative costs. Vessel revenues and operating costs relate to our owned and operated vessels while other operating revenues relate to the activities of our other miscellaneous marine-related businesses. (In Thousands) Year Ended December 31, 2021 2020 2019 Revenues: Vessel revenues: Americas $ 102,151 $ 126,676 $ 136,958 Middle East/Asia Pacific 102,537 97,133 90,321 Europe/Mediterranean 80,914 83,602 123,711 West Africa 75,967 78,763 126,025 Total vessel revenues 361,569 386,174 477,015 Other operating revenues 9,464 10,864 9,534 Total revenues 371,033 397,038 486,549 Vessel operating profit (loss): Americas (11,270 ) 4,944 (805 ) Middle East/Asia Pacific (1,174 ) (5,935 ) (6,044 ) Europe/Mediterranean (16,968 ) (8,629 ) (1,289 ) West Africa (16,985 ) (27,508 ) 8,298 Total vessel operating profit (loss) (46,397 ) (37,128 ) 160 Other operating profit 7,233 7,458 6,734 (39,164 ) (29,670 ) 6,894 Corporate expenses (36,908 ) (35,633 ) (57,988 ) Gain (loss) on asset dispositions, net (2,901 ) 7,591 2,263 Affiliate credit loss impairment expense (400 ) (52,981 ) — Affiliate guarantee obligation — (2,000 ) — Asset impairments and other (15,643 ) (74,109 ) (37,773 ) Operating loss $ (95,016 ) $ (186,802 ) $ (86,604 ) Depreciation and amortization: Americas $ 30,856 $ 32,079 $ 27,493 Middle East/Asia Pacific 25,992 24,244 21,440 Europe/Mediterranean 28,163 29,222 30,053 West Africa 26,196 27,787 21,166 Corporate and other 3,337 3,377 1,779 Total depreciation and amortization $ 114,544 $ 116,709 $ 101,931 Additions to properties and equipment: Americas $ — $ 2,842 $ 969 Middle East/Asia Pacific (42 ) 2,629 5,237 Europe/Mediterranean 764 1,059 4,001 West Africa 6,341 6,028 2,721 Corporate 1,888 2,342 5,070 Total additions to properties and equipment $ 8,951 $ 14,900 $ 17,998 Total assets: Americas $ 278,394 $ 338,649 $ 375,297 Middle East/Asia Pacific 183,287 226,422 270,413 Europe/Mediterranean 293,760 302,214 358,943 West Africa 223,988 242,825 376,087 Corporate 116,351 141,067 198,788 Total assets $ 1,095,780 $ 1,251,177 $ 1,579,528 The following table discloses our customers that accounted for 10% Year Ended December 31, 2021 2020 2019 Chevron Corporation 15.7 % 14.3 % 13.0 % Saudi Aramco 11.8 % 11.5 % * * Less than 10%

Note 14 - Restructuring Charges

Note 14 - Restructuring Charges	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	( 14 RESTRUCTURING CHARGES In the fourth 2018, December 31, 2021, 2020 2019, Activity for the lease exit and severance liabilities for the two December 31, 2021 Lease Exit Costs Severance (In Thousands) Europe/ Mediterranean Corporate Company Total Balance at December 31, 2019 $ 1,791 $ 2,318 $ 272 $ 4,381 Charges 71 63 1,367 1,501 Cash payments (306 ) (602 ) (1,639 ) (2,547 ) Balance at December 31, 2020 $ 1,556 $ 1,779 $ — $ 3,335 Charges 96 78 — 174 Cash payments (505 ) (1,495 ) — (2,000 ) Balance at December 31, 2021 $ 1,147 $ 362 $ — $ 1,509

Note 15 - Subsequent Event

Note 15 - Subsequent Event	12 Months Ended
	Dec. 31, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	( 15 SUBSEQUENT EVENTS Sonatide Acquisition In January 2022 The acquisition date fair value of the 49% equity interest in Sonatide held by us was zero and we do not 51% no Business combination related costs were expensed as incurred in general and administrative expense and consisted of various advisory, legal, accounting, valuation and other professional fees which were not December 31, 2021. Swire Pacific Offshore Holdings Ltd. Acquisition On March 9, 2022, second 2022. one

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Nature of Operations [Policy Text Block]	Nature of Operations We provide offshore support vessels and marine support services to the global offshore energy industry through the operation of a diversified fleet of offshore marine service vessels. Our revenues, net earnings and cash flows from operations are dependent upon the activity level of the vessel fleet (utilization) and the price we charge for these services (day-rate). The level of our business activity is driven by the amount of installed offshore oil and gas production facilities, the level of offshore drilling and exploration activity, and the general level of offshore construction projects such as pipeline and windfarm construction and support. Our customers’ offshore activity, in turn, is dependent on crude oil and natural gas prices, which fluctuate depending on the respective levels of supply and demand for crude oil and natural gas and the outlook for such levels. Unless otherwise required by the context, the terms “we”, “us”, “our” and “company” as used herein refer to Tidewater Inc. and its consolidated subsidiaries and predecessors.
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The consolidated financial statements included herein, presented in accordance with United States generally accepted accounting principles and stated in U.S. dollars, have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements include the accounts of Tidewater Inc. and its subsidiaries. Intercompany balances and transactions are eliminated in consolidation.
Segment Reporting, Policy [Policy Text Block]	Reporting Segments Reporting business segments are defined as a component of an enterprise for which separate financial information is available and is evaluated by the chief operating decision maker in deciding how to allocate resources and in assessing performance. Our segments are based on geographic markets: the Americas segment, which includes the U.S. Gulf of Mexico (GOM), Trinidad, Mexico and Brazil; the Middle East/Asia Pacific segment, which includes Saudi Arabia, East Africa, Southeast Asia and Australia; the Europe/Mediterranean segment, which includes the United Kingdom, Norway and Egypt; and the West Africa segment, which includes Angola, Nigeria, and other coastal regions of West Africa.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates in Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the recorded amounts of revenues and expenses during the reporting period. The accompanying consolidated financial statements include estimates for allowance for credit losses, useful lives of property and equipment, estimated net realizable value of assets held for sale and marine operating supplies, income tax provisions, impairments, commitments and contingencies and certain accrued liabilities. We evaluate our estimates and assumptions on an ongoing basis based on a combination of historical information and various other assumptions that are considered reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not may
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents We consider all highly liquid investments with maturities of three
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash We consider cash as restricted when there are contractual agreements that govern the use or withdrawal of the funds.
Inventory Supplies, Policy [Policy Text Block]	Marine Operating Supplies Marine operating supplies, which consist primarily of operating parts and supplies for our vessels as well as fuel, are stated at the lower of weighted-average cost or net realizable value.
Property, Plant and Equipment, Policy [Policy Text Block]	Properties and Equipment Capitalization, Depreciation and Amortization Upon emergence from Chapter 11 July 31, 2017, may no Maintenance and Repairs Most of our vessels require certification inspections twice in every five may Maintenance costs incurred at the time of the recertification drydocking that are not Costs related to vessel improvements that either extend the vessel’s useful life or increase the vessel’s functionality are capitalized and depreciated. Vessel modifications that are performed for a specific customer contract are capitalized and amortized over the firm contract term. Major modifications to equipment that are being performed not Net Properties and Equipment The following are summaries of net properties and equipment: (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 As of December 31, 2021 December 31, 2020 not 7 In the fourth 2021, 2023 two
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets We review the vessels in our active fleet for impairment whenever events occur or changes in circumstances indicate that the carrying amount of an asset group may not may We estimate cash flows based upon historical data adjusted for our best estimate of expected future market performance, which, in turn, is based on industry trends. The primary estimates and assumptions used in reviewing active vessel groups for impairment and estimating undiscounted cash flows include utilization rates, average day rates and average daily operating expenses. These estimates are made based on recent actual trends in utilization, day rates and operating costs and reflect management’s best estimate of expected market conditions during the period of future cash flows. These assumptions and estimates have changed considerably as market conditions have changed, and they are reasonably likely to continue to change as market conditions change in the future. Although we believe our assumptions and estimates are reasonable, deviations from the assumptions and estimates could produce materially different results. Management estimates may If an asset group fails the undiscounted cash flow test, we estimate the fair value of that asset group and compare such estimated fair value to the carrying value of that asset group in order to determine if impairment exists. From time to time, we designate assets for disposal. Cost and related accumulated depreciation associated with assets designated for disposal are removed from the property and equipment accounts and reclassified to assets held for sale at estimated net realizable value. Any excess of previous net book value over estimated net realizable value is charged to impairment expense. Refer to Note ( 7 2021
Accrued Property And Liability Losses Policy [Policy Text Block]	Accrued Property and Liability Losses Our insurance coverage is provided by third
Pension and Other Postretirement Plans, Policy [Policy Text Block]	Pension Benefits We follow the provisions of Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 715, , December 31 Our pension cost consists of service costs, interest costs, expected returns on plan assets, amortization of prior service costs or benefits and actuarial gains and losses. We consider various factors in developing pension assumptions, including an evaluation of relevant discount rates, expected long-term returns on plan assets, plan asset allocations, expected changes in retirement benefits, analyses of current market conditions and input from actuaries and other consultants. For the long-term rate of return, we developed assumptions regarding the expected rate of return on plan assets based on historical experience and projected long-term investment returns, which consider the plan’s target asset allocation and long-term asset class return expectations. Assumptions for the discount rate reflect the theoretical rate at which liabilities could be settled in the bond market at December 31, 2021
Income Tax, Policy [Policy Text Block]	Income Taxes Income taxes are accounted for in accordance with the provisions of ASC 740, Income Taxes not We record uncertain tax positions on the basis of a two 1 not 2 not 50
Revenue [Policy Text Block]	Revenue Recognition Our primary source of revenue derives from time charter contracts of our vessels on a rate per day of service basis; therefore, vessel revenues are recognized on a daily basis throughout the contract period. The base rate of hire for a time charter contract is generally a fixed rate, provided, however, that some longer-term contracts at times include escalation clauses to recover specific additional costs.
Cost of Goods and Service [Policy Text Block]	Operating Costs Vessel operating costs consist primarily of costs such as crew wages; repair and maintenance; insurance; fuel, lube oil and supplies; and other vessel expenses, which include costs such as brokers’ commissions, training costs, agent fees, port fees, canal transit fees, temporary importation fees, vessel certification fees, and satellite communication fees. Repair and maintenance costs include both routine costs and major repairs carried out during drydockings, which occur during the economic useful life of the vessel. Vessel operating costs are recognized as incurred.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation The U.S. dollar is the functional currency for all our existing international operations, as transactions in these operations are predominately denominated in U.S. dollars. Foreign currency exchange gains and losses from the revaluation of our foreign currency denominated monetary assets and liabilities are included in the consolidated statements of operations.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share We report both basic earnings (loss) per share and diluted earnings (loss) per share. The calculation of basic earnings (loss) per share is computed based on the weighted average number of shares of common stock outstanding. Diluted earnings (loss) per share is computed based on the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings (loss) per share includes the dilutive effect of stock options and restricted stock grants (both time and performance based) awarded as part of our share-based compensation and incentive plans as well as our outstanding warrants. Per share amounts disclosed in these Notes to Consolidated Financial Statements, unless otherwise indicated, are on a diluted basis. The components of basic and diluted earnings (loss) per share, are as follows: (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 (A) For years ended December 31, 2021, 2020 2019
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of Credit Risk Our financial instruments that are exposed to concentrations of credit risk consist primarily of trade and other receivables from a variety of domestic, international and national energy companies. We manage our exposure to risk by performing ongoing credit evaluations of our customers’ financial condition and may 50%. not
Share-based Payment Arrangement [Policy Text Block]	Stock-Based Compensation Stock-based compensation transactions are accounted for using a fair-value-based method. We use the Black-Scholes option-pricing model to determine the fair-value of stock-based awards.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Income (Loss) We report total comprehensive income (loss) and its components. Accumulated other comprehensive income (loss) is comprised of any minimum pension liability for our U.S. Defined Benefits Pension Plans.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value Measurements We follow the provisions of ASC 820, 820 not one Level 1: Level 2: Level 3: not Our primary financial instruments consist of cash and cash equivalents, restricted cash, trade receivables and trade payables with book values that are considered to be representative of their respective fair values. Our cash equivalents, which are securities with maturities less than 90
New Accounting Pronouncements, Policy [Policy Text Block]	R ecently Adopted Accounting Pronouncements From time-to-time new accounting pronouncements are issued by the FASB that we adopt as of the specified effective date. Unless otherwise discussed, management believes that the impact of recently issued standards, which are not not On August 28, 2018, 2018 13, no 1 2 3 January 1, 2020 not 7 On June 16, 2016, 2016 13, Expected credit losses are recognized on the initial recognition of our trade accounts receivable, contract assets and net amounts due from our less than 50% not five January 1, 2020, first not January 1, 2020 Activity in the allowance for credit losses for the years ended December 31, 2021 2020 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 In 2019, In December 2019, 2019 12, 740 December 15, 2020 January 1, 2021 not In August 2018 2018 14, no December 15, 2020 January 1, 2021 not Recently Issued Accounting Standards Not In November 2021, 2021 10, December 15, 2021, January 1, 2022, In October 2021, 2021 08, 805, 606, December 15, 2022 In July 2021, 2021 05, 842, not 1 December 15, 2021, January 1, 2022, not In May 2021, 2021 04, December 15, 2021, January 1, 2022, not

Note 1 - Nature of Operations_2

Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	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

Note 3 - Debt (Tables)

Note 3 - Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	(In Thousands) December 31, December 31, 2021 2020 Senior secured bonds: 8.50 November 2026 $ 175,000 $ — Senior secured notes: 8.00 August 2022 — 147,049 Troms offshore borrowings: NOK denominated notes due May 2024 January 2026 — 20,513 USD denominated notes due January April 2027 — 30,413 175,000 197,975 Debt discount and issuance costs (7,115 ) (5,244 ) Less: Current portion of long-term debt — (27,797 ) Total long-term debt $ 167,885 $ 164,934
Interest And Debt Costs Incurred Net Of Interest Capitalized [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Total interest and debt costs incurred $ 15,607 $ 24,156 $ 29,068 Less: interest costs capitalized (24 ) — — Total interest and debt costs $ 15,583 $ 24,156 $ 29,068

Note 4 - Investment in Uncons_2

Note 4 - Investment in Unconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	(In Thousands) December 31, December 31, 2021 2020 Due from affiliates: Angolan joint venture (Sonatide) $ 49,011 $ 41,623 Nigerian joint venture (DTDW) 21,123 20,427 70,134 62,050 Due to affiliates: Sonatide $ 40,432 $ 32,767 DTDW 21,123 20,427 61,555 53,194 Due from affiliates, net of due to affiliates $ 8,579 $ 8,856
Schedule of Amounts Due From Affiliate [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Due from Sonatide at beginning of year $ 41,623 $ 89,246 $ 109,176 Revenue earned by the company through Sonatide 41,775 44,254 52,372 Less amounts received from Sonatide (26,429 ) (36,160 ) (60,486 ) Less amounts used to offset Due to Sonatide obligations (A) (8,530 ) (11,848 ) (10,551 ) Less impairment of due from affiliate (400 ) (40,900 ) — Other 972 (2,969 ) (1,265 ) $ 49,011 $ 41,623 $ 89,246
Schedule of Amoutns Due to Affiliate [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Due to Sonatide at beginning of year $ 32,767 $ 31,475 $ 29,347 Plus commissions payable to Sonatide 3,832 4,152 4,937 Plus amounts paid by Sonatide on behalf of the company 10,914 9,037 9,654 Less commissions paid to Sonatide — — (5,961 ) Less amounts used to offset Due from Sonatide obligations (A) (8,530 ) (11,848 ) (10,551 ) Other 1,449 (49 ) 4,049 $ 40,432 $ 32,767 $ 31,475

Note 5 - Income Taxes (Tables)

Note 5 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule Of Losses Before Income Tax Domestic And Foreign [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Non-U.S. $ (58,476 ) $ (137,225 ) $ (44,205 ) United States (65,309 ) (60,436 ) (69,290 ) $ (123,785 ) $ (197,661 ) $ (113,495 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	(In Thousands) U.S. Federal State Non-U.S. Total Year Ended December 31, 2019 Current $ 649 $ — $ 26,403 $ 27,052 Deferred 672 — — 672 $ 1,321 $ — $ 26,403 $ 27,724 Year Ended December 31, 2020 Current $ (21,005 ) $ — $ 18,816 $ (2,189 ) Deferred (30 ) — 1,254 1,224 $ (21,035 ) $ — $ 20,070 $ (965 ) Year Ended December 31, 2021 Current $ 682 $ — $ 6,480 $ 7,162 Deferred (1,418 ) — 131 (1,287 ) $ (736 ) $ — $ 6,611 $ 5,875
Schedule Of Income Tax Expense Benefit Reconciliation [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Computed “expected” tax benefit $ (25,995 ) $ (41,509 ) $ (23,834 ) Increase (reduction) resulting from: Foreign income taxed at different rates 10,984 27,639 9,283 Uncertain tax positions (25,417 ) (62,833 ) 5,145 Valuation allowance - deferred tax assets 34,566 43,455 15,707 Valuation allowance - deferred tax true-up 29,711 (6,523 ) — Deferred tax true-up (29,789 ) 6,523 — Foreign taxes 15,220 12,520 20,778 Return to accrual (7,691 ) 11,401 (2,247 ) 162(m) - Executive compensation 125 286 28 Subpart F income 484 5,631 1,227 Other, net 3,677 2,445 1,637 $ 5,875 $ (965 ) $ 27,724
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	(In Thousands) December 31, December 31, 2021 2020 Deferred tax assets: Accrued employee benefit plan costs $ 7,275 $ 8,815 Stock based compensation 649 407 Net operating loss and tax credit carryforwards 215,797 148,699 Restructuring fees not currently deductible for tax purposes 566 1,415 Disallowed business interest expense carryforward 10,386 5,546 Other 3,152 2,518 Gross deferred tax assets 237,825 167,400 Less valuation allowance (204,899 ) (140,428 ) Net deferred tax assets 32,926 26,972 Deferred tax liabilities: Depreciation and amortization (31,745 ) (25,883 ) Outside basis difference deferred tax liability (2,891 ) (2,891 ) Foreign interest withholding tax (990 ) (859 ) Other 572 (754 ) Gross deferred tax liabilities (35,054 ) (30,387 ) Net deferred tax assets (liabilities) $ (2,128 ) $ (3,415 )
Schedule Of Uncertain Tax Positions And Income Tax Payable [Table Text Block]	(In Thousands) December 31, December 31, 2021 2020 Tax liabilities for uncertain tax positions $ 29,283 $ 35,304 Income tax payable 11,480 15,928 Income tax receivable 1,322 8,280
Summary of Income Tax Contingencies [Table Text Block]	(In Thousands) Balance at December 31, 2018 $ 399,292 Additions based on tax positions related to the current year 14,741 Additions based on tax positions related to a prior year 1,964 Settlement and lapse of statute of limitations (1,897 ) Reductions based on tax positions related to a prior year (58 ) Balance at December 31, 2019 (A) $ 414,042 Additions based on tax positions related to a prior year 2,223 Settlement and lapse of statute of limitations (64,458 ) Reductions based on tax positions related to a prior year (760 ) Balance at December 31, 2020 (A) $ 351,047 Additions based on tax positions related to the current year 53 Additions based on tax positions related to a prior year 18,515 Settlement and lapse of statute of limitations (35,962 ) Balance at December 31, 2021 (A) $ 333,653

Note 6 - Leases (Tables)

Note 6 - Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Lessee Operating Lease Assets And Liabilities[ Table Text Block]	Leases (In Thousands) Classification December 31, 2021 December 31, 2020 Assets: Operating Other assets $ 3,441 $ 3,372 Liabilities: Current Operating Other current liabilities 1,405 1,134 Noncurrent Operating Other liabilities 3,301 2,668 Total lease liabilities $ 4,706 $ 3,802
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Maturity of lease liabilities (In Thousands) Operating leases 2022 $ 2,205 2023 1,183 2024 741 2025 748 2026 680 After 2026 316 Total lease payments 5,873 Less: Interest (1,167 ) Present value of lease liabilities $ 4,706
Lease, Cost [Table Text Block]	(In Thousands) Year Ended Year Ended Year Ended Lease costs Classification December 31, 2021 December 31, 2020 December 31, 2019 Operating lease costs General and administrative $ 1,369 $ 1,270 $ 1,336 Short-term leases General and administrative 2,529 3,483 4,840 Variable lease costs General and administrative 412 392 313 Sublease income General and administrative — — (3 ) Net lease cost $ 4,310 $ 5,145 $ 6,486
Lessee Operating Lease Term And Discount Rate [Table Text Block]	Lease term and discount rate December 31, 2021 Weighted average remaining lease term in years 3.3 Weighted average discount rate 7.4 %

Note 7 - Assets Held for Sale_2

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	(In Thousands, except number of vessels) Number of Vessels 2021 Number of Vessels 2020 Number of Vessels 2019 Beginning balance 23 $ 34,396 46 $ 39,287 — $ — Additions 7 18,096 32 97,663 46 66,033 Sales (9 ) (15,433 ) (53 ) (26,877 ) — — Reactivation (3 ) (7,250 ) (2 ) (500 ) — — Impairment — (15,388 ) — (75,177 ) — (26,746 ) Ending balance 18 $ 14,421 23 $ 34,396 46 $ 39,287
Schedule Of Gain Loss On Disposition Of Assets [Table Text Block]	(In Thousands, except number of vessels) 2021 2020 2019 Vessels sold from active fleet 10 3 40 Gain on sale of active vessels, net $ 3,499 $ 1,217 $ 2,434 Vessels sold from assets held for sale 9 53 — Gain (loss) on vessels sold from assets held for sale, net $ (6,209 ) $ 6,384 $ — Total vessels sold 19 56 40 Total gain (loss) on sales of vessels, net $ (2,710 ) $ 7,601 $ 2,434
Schedule of Asset Impairment Charges [Table Text Block]	(In Thousands, except number of vessels) Number of Vessels 2021 Number of Vessels 2020 Number of Vessels 2019 Assets held for sale 8 $ 15,388 47 $ 75,177 35 $ 26,746 Reactivation of asset held for sale 1 (1,650 ) — — — — Obsolete inventory — 1,905 — 2,959 — 5,223 Other — — — (4,027 ) — 5,804 Total impairment and other expense $ 15,643 $ 74,109 $ 37,773

Note 8 - Employee Retirement _2

Note 8 - Employee Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Allocation of Plan Assets [Table Text Block]	Actual as of Actual as of Target December 31, 2021 December 31, 2020 U.S. Pension plan: Cash — % 2 % 3 % Debt securities 50 % 34 % 53 % Equity securities 50 % 64 % 44 % Total 100 % 100 % 100 %
Schedule Of Fair Value Plan Assets Measured On Recurring Basis [Table Text Block]	Quoted prices in Significant Significant active observable unobservable Measured at (In Thousands) markets inputs inputs Net Asset Fair Value (Level 1) (Level 2) (Level 3) Value Pension plan measured at fair value: Equity securities, primarily exchange traded funds $ 36,240 $ 36,240 $ — $ — $ — Debt securities, primarily mutual funds 19,628 19,628 — — — Cash and cash equivalents 911 — 911 — — Total fair value of plan assets $ 56,779 $ 55,868 $ 911 $ — $ — Quoted prices in Significant Significant active observable unobservable Measured at (In Thousands) markets inputs inputs Net Asset Fair Value (Level 1) (Level 2) (Level 3) Value Pension plan measured at fair value: Equity securities, primarily exchange traded funds $ 24,947 $ 21,780 $ — $ — $ 3,167 Debt securities, primarily exchange traded funds 29,922 17,925 — — 11,997 Cash and cash equivalents 1,626 — 1,626 — — Total fair value of plan assets $ 56,495 $ 39,705 $ 1,626 $ — $ 15,164
Schedule of Net Funded Status [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Change in benefit obligation: Benefit obligation at beginning of the period $ 88,960 $ 91,654 $ 90,247 Service cost — 112 427 Interest cost 2,168 2,907 3,751 Benefits paid (5,693 ) (5,990 ) (5,967 ) Actuarial (gain) loss (A) (1,127 ) 5,277 8,198 Settlement — (4,407 ) (4,978 ) Foreign currency exchange rate changes — (593 ) (24 ) Benefit obligation at end of the period $ 84,308 $ 88,960 $ 91,654 Change in plan assets: Fair value of plan assets at beginning of the period $ 56,495 $ 59,625 $ 56,790 Actual return 4,374 6,890 7,498 Actuarial loss — 18 983 Administrative expenses — (49 ) (68 ) Employer contributions 1,603 1,615 5,027 Benefits paid (5,693 ) (5,990 ) (5,967 ) Settlement — (5,000 ) (4,638 ) Foreign currency exchange rate changes — (614 ) — Fair value of plan assets at end of the period 56,779 56,495 59,625 Unfunded status at end of the period $ (27,529 ) $ (32,465 ) $ (32,029 ) Net amount recognized in the balance sheet consists of: Current liabilities $ (1,578 ) $ (1,524 ) $ (1,422 ) Noncurrent liabilities (25,951 ) (30,941 ) (30,607 ) Net amount recognized $ (27,529 ) $ (32,465 ) $ (32,029 )
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]	(In Thousands) December 31, December 31, 2021 2020 Projected and accumulated benefit obligation $ 84,308 $ 88,960 Fair value of plan assets 56,779 56,495
Schedule of Net Benefit Costs [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Service cost $ — $ 109 $ 427 Interest cost 2,168 2,907 3,751 Expected return on plan assets (2,174 ) (2,191 ) (2,375 ) Administrational expenses — 49 71 Payroll tax of net pension costs — 14 55 Amortization of net actuarial losses 145 (5 ) (592 ) Settlement/curtailment (gain) loss — 738 (219 ) Net periodic pension cost $ 139 $ 1,621 $ 1,118
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	Pension Benefits (In Thousands) Year Ended December 31, 2021 2020 2019 Net (gain) loss $ (3,472 ) $ (568 ) $ 2,612 Settlement recognized — — (182 ) Total recognized in other comprehensive (income) loss, before tax and net of tax $ (3,472 ) $ (568 ) $ 2,430
Defined Benefit Plan, Assumptions [Table Text Block]	Pension Benefits 2021 2020 Discount rate 2.5 % 3.5 % Expected long-term rate of return on assets 4.0 % 4.0 % Rates of annual increase in compensation levels N/A 2.3 %
Schedule of Expected Benefit Payments [Table Text Block]	Pension Year ending December 31, (In Thousands) Benefits 2022 $ 5,911 2023 5,863 2024 5,816 2025 5,746 2026 5,648 2027 – 2031 26,188 Total 10-year estimated future benefit payments $ 55,172

Note 9 - Stock-based Compensa_2

Note 9 - Stock-based Compensation and Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule Of Common Stock Shares Reserved For Issuance And Shares Available For Grant [Table Text Block]	Year Ended December 31, 2021 2020 2019 Shares of common stock reserved for issuance under the plans 6,473,228 3,973,228 3,973,228 Shares of common stock available for future grants 3,037,187 1,591,577 2,187,101
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Weighted-average Time Weight-average Grant-Date Based Grant Date Performance Fair Value Units Fair Value Based Units 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 Granted 13.26 452,403 — — Vested 10.97 (406,604 ) — — Cancelled/forfeited 24.50 (1,769 ) — — Non-vested balance at December 31, 2021 $ 10.37 776,113 $ 24.50 30,449
Schedule Of Allocated Share Based Compensation Expense Recognized Period Costs [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Grant date fair value of restricted stock units vested $ 4,460 $ 6,395 $ 19,193 Restricted stock unit compensation expense 5,638 5,117 19,603
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	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, 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 $ — — $ — — $ — —

Note 10 - Stockholders' Equity

Note 10 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Stock by Class [Table Text Block]	December 31, December 31, 2021 2020 Common stock shares authorized 125,000,000 125,000,000 Common stock par value $ 0.001 $ 0.001 Common stock shares issued 41,307,617 40,704,984 Preferred stock shares authorized 3,000,000 3,000,000 Preferred stock par value No par No par Preferred stock shares issued — —
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Balance at December 31 $ (804 ) $ (236 ) $ 2,194 Pension benefits recognized in OCI 3,472 (568 ) (2,430 ) Balance at December 31 $ 2,668 $ (804 ) $ (236 )

Note 12 - Accrued Expenses, O_2

Note 12 - Accrued Expenses, Other Current Liabilities, and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Other Current Liabilities [Table Text Block]	(In Thousands) 2021 2020 Payroll and related payables $ 18,627 $ 17,201 Accrued vessel expenses 19,662 17,129 Accrued interest expense 1,859 3,240 Other accrued expenses 11,586 14,852 $ 51,734 $ 52,422 (In Thousands) 2021 2020 Taxes payable $ 18,977 $ 23,883 Other 4,888 8,902 $ 23,865 $ 32,785
Other Liabilities [Table Text Block]	(In Thousands) 2021 2020 Pension liabilities $ 26,872 $ 31,736 Liability for uncertain tax positions 29,283 35,304 Other 12,029 12,752 $ 68,184 $ 79,792

Note 13 - Segment Information_2

Note 13 - Segment Information, Geographic Data and Major Customers (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	(In Thousands) Year Ended December 31, 2021 2020 2019 Revenues: Vessel revenues: Americas $ 102,151 $ 126,676 $ 136,958 Middle East/Asia Pacific 102,537 97,133 90,321 Europe/Mediterranean 80,914 83,602 123,711 West Africa 75,967 78,763 126,025 Total vessel revenues 361,569 386,174 477,015 Other operating revenues 9,464 10,864 9,534 Total revenues 371,033 397,038 486,549 Vessel operating profit (loss): Americas (11,270 ) 4,944 (805 ) Middle East/Asia Pacific (1,174 ) (5,935 ) (6,044 ) Europe/Mediterranean (16,968 ) (8,629 ) (1,289 ) West Africa (16,985 ) (27,508 ) 8,298 Total vessel operating profit (loss) (46,397 ) (37,128 ) 160 Other operating profit 7,233 7,458 6,734 (39,164 ) (29,670 ) 6,894 Corporate expenses (36,908 ) (35,633 ) (57,988 ) Gain (loss) on asset dispositions, net (2,901 ) 7,591 2,263 Affiliate credit loss impairment expense (400 ) (52,981 ) — Affiliate guarantee obligation — (2,000 ) — Asset impairments and other (15,643 ) (74,109 ) (37,773 ) Operating loss $ (95,016 ) $ (186,802 ) $ (86,604 ) Depreciation and amortization: Americas $ 30,856 $ 32,079 $ 27,493 Middle East/Asia Pacific 25,992 24,244 21,440 Europe/Mediterranean 28,163 29,222 30,053 West Africa 26,196 27,787 21,166 Corporate and other 3,337 3,377 1,779 Total depreciation and amortization $ 114,544 $ 116,709 $ 101,931 Additions to properties and equipment: Americas $ — $ 2,842 $ 969 Middle East/Asia Pacific (42 ) 2,629 5,237 Europe/Mediterranean 764 1,059 4,001 West Africa 6,341 6,028 2,721 Corporate 1,888 2,342 5,070 Total additions to properties and equipment $ 8,951 $ 14,900 $ 17,998 Total assets: Americas $ 278,394 $ 338,649 $ 375,297 Middle East/Asia Pacific 183,287 226,422 270,413 Europe/Mediterranean 293,760 302,214 358,943 West Africa 223,988 242,825 376,087 Corporate 116,351 141,067 198,788 Total assets $ 1,095,780 $ 1,251,177 $ 1,579,528
Entity Wide Major Customer Amount [Table Text Block]	Year Ended December 31, 2021 2020 2019 Chevron Corporation 15.7 % 14.3 % 13.0 % Saudi Aramco 11.8 % 11.5 % *

Note 14 - Restructuring Charg_2

Note 14 - Restructuring Charges (Tables)	12 Months Ended
	Dec. 31, 2021
Notes Tables
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	Lease Exit Costs Severance (In Thousands) Europe/ Mediterranean Corporate Company Total Balance at December 31, 2019 $ 1,791 $ 2,318 $ 272 $ 4,381 Charges 71 63 1,367 1,501 Cash payments (306 ) (602 ) (1,639 ) (2,547 ) Balance at December 31, 2020 $ 1,556 $ 1,779 $ — $ 3,335 Charges 96 78 — 174 Cash payments (505 ) (1,495 ) — (2,000 ) Balance at December 31, 2021 $ 1,147 $ 362 $ — $ 1,509

Note 1 - Nature of Operations_3

Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021USD ($)shares	Dec. 31, 2021shares	Dec. 31, 2020shares	Dec. 31, 2019USD ($)shares	Jan. 01, 2020USD ($)
Highly Liquid Investments Maturity Period (Year)		3 years
Inspection Interval (Year)		5 years
Increase Of Amortization Period (Month)		30 months
Number Of Offshore Supply Vessels		153	172
Number Of Vessels Disposed		18	23
Number of Ocean Going Tugs, Contracted To Build	2	2
Ocean Going Tugs, Expected Cost, Each	$ 6.3
Down Payments To Start Construction On Tugboats	$ 2.3
Accounts Receivable, Allowance for Credit Loss, Ending Balance				$ 2.7
Accounts Receivable, Allowance for Credit Loss, Writeoff				$ 2.6
Accounting Standards Update 2016-13 [Member]
Accounts Receivable, Allowance for Credit Loss, Ending Balance					$ 0.2
Out-of-the-money Warrants [Member]
Class of Warrant or Right, Outstanding (in shares) | shares	5,923,399	5,923,399	5,923,399	5,923,399
Marine Equipment [Member]
Property, Plant and Equipment, Salvage Value, Percentage	7.50%	7.50%
Marine Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years
Marine Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		20 years
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		10 years
Remaining Number Of Vessels [Member]
Number of Vessels		135
Actively Employed Vessels [Member]
Number of Vessels		126
Stacked Vessels [Member]
Number of Vessels		9	35

Note 1 - Nature of Operations_4

Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Vessels and related equipment	$ 898,649	$ 940,175
Other properties and equipment	19,625	16,861
Property, Plant and Equipment, Gross, Ending Balance	918,274	957,036
Less accumulated depreciation and amortization	230,234	176,718
Net properties and equipment	$ 688,040	$ 780,318

Note 1 - Nature of Operations_5

Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net loss available to common shareholders		$ (128,969)	$ (196,242)	$ (141,743)
Weighted average outstanding shares of common stock, basic (in shares)		41,008,907	40,354,638	38,204,934
Dilutive effect of options, warrants and stock awards (in shares)		0	0	0
Weighted average common stock and equivalents (in shares)		41,008,907	40,354,638	38,204,934
Loss per share, basic (in dollars per share)		$ (3.14)	$ (4.86)	$ (3.71)
Loss per share, diluted (in dollars per share)		$ (3.14)	$ (4.86)	$ (3.71)
In The Money Options Warrants And Restricted Stock Awards And Units [Member]
Incremental "in-the-money" options, warrants, and restricted stock awards and units outstanding at the end of the period (A) (in shares)	[1]	2,345,948	2,235,310	2,483,956
[1]	For years ended December 31, 2021, 2020 and 2019 we also had 5,923,399 shares of “out-of- the-money” warrants outstanding at the end of each period.

Note 1 - Nature of Operations_6

Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance		$ 2,700
Affiliate credit loss impairment expense	$ 400	52,981	$ 0
Write offs			(2,600)
Balance			2,700
Trade Accounts Receivable [Member]
Balance	1,516	70
Affiliate credit loss impairment expense	838	1,283
Other	0	0
Write offs	(406)
Other	0	0
Balance	1,948	1,516	70
Trade Accounts Receivable [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		163
Balance			163
Due from Affiliate [Member]
Balance	71,800	20,083
Affiliate credit loss impairment expense	400	52,981
Other	256	(1,264)
Write offs	0
Other	256	(1,264)
Balance	$ 72,456	71,800	20,083
Due from Affiliate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		$ 0
Balance			$ 0

Note 2 - Revenue Recognition (D

Note 2 - Revenue Recognition (Details Textual) - Vessel [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	$ 1.8	$ 2.2
Other Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	2.6	4.3
Other Current Liabilities [Member]
Contract with Customer, Liability, Current	$ 0.6	$ 0.4

Note 3 - Debt (Details Textual)

Note 3 - Debt (Details Textual) $ in Thousands, kr in Millions	Nov. 16, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014NOK (kr)	Nov. 30, 2020USD ($)	Nov. 30, 2019USD ($)	Jul. 31, 2017USD ($)
Gain (Loss) on Extinguishment of Debt, Total			$ (11,100)	$ 0	$ 0
Restricted Cash, Current		$ 2,079	1,240	2,079
Troms Offshore [Member] | Senior Notes [Member] | Plan Of Reorganization [Member]
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum		45,000		$ 45,000
Repayments of Long-term Debt, Total		$ 12,500	23,300
Tender Offer [Member]
Debt Instrument, Repurchased Face Amount									$ 125,000
Debt Instrument, Repurchase Amount									$ 135,600
Premium Paid On Debt Repurchase									8.50%
Cost Associated With Debt Modification									$ 11,400
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Long-term Line of Credit, Total			0
Debt Instrument, Mandatory Prepayment, Minimum Vessel Collateral	75,000
Debt Instrument, Mandatory Prepayment, Minimum Aggregate Nominal Amount Outstanding	$ 75,000
Revolving Credit Facility [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	4.00%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	4.00%
Nordic Bond [Member]
Debt Instrument, Face Amount	$ 175,000
Debt Instrument, Issue Price Percentage	98.50%
Debt Instrument, Interest Rate, Stated Percentage	8.50%
Debt Instrument, Option to Issue Additional Amount	$ 25,000
Debt Instrument, Monthly Deposit into Reserve Account, Percentage of Interest Payment	16.67%
Debt Instrument, Covenant, Minimum Free Liquidity Amount	$ 20,000
Debt Instrument, Covenant, Minimum Free Liquidity, Percentage of Net Interest Bearing Debt	10.00%
Debt Instrument, Covenant, Percentage of Minimum Equity Ratio	30.00%
Long-term Debt, Fair Value			177,600
Nordic Bond [Member] | GOLP and TMII [Member]
Debt Instrument, Collateral, Percentage of Equity Interests	66.00%
The 8.00% Senior Secured Notes due August 2022 [Member]
Debt Instrument, Face Amount										$ 350,000
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%		8.00%						8.00%
Gain (Loss) on Extinguishment of Debt, Total	$ (11,100)
Repayments of Debt			$ 11,800	$ 27,700
Debt Instrument, Repurchased Face Amount								$ 50,000
Debt Instrument, Repurchase Amount								$ 50,300
NOK Denominated Notes Due May 2024 and January 2026 [Member] | Troms Offshore [Member]
Debt Instrument, Term (Year)							12 years
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member]
Debt Instrument, Face Amount | kr							kr 504.4
Debt Instrument, Interest Rate, Stated Percentage			8.50%
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member]
Debt Instrument, Face Amount						$ 60,800
Debt Instrument, Term (Year)						12 years
Long-term Debt, Total		$ 50,900		$ 50,900
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] | Minimum [Member]
Capitalization Rate						4.56%
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] | Maximum [Member]
Capitalization Rate						6.13%

Note 3 - Debt - Summary of Debt

Note 3 - Debt - Summary of Debt Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term debt, gross	$ 175,000	$ 197,975
Debt discount and issuance costs	(7,115)	(5,244)
Less: Current portion of long-term debt	0	(27,797)
Total long-term debt	167,885	164,934
The 8.00% Senior Secured Notes due August 2022 [Member]
Long-term debt, gross	0	147,049
Troms Offshore [Member] | NOK Denominated Notes Due January 2026 [Member]
Long-term debt, gross	175,000	0
Troms Offshore [Member] | NOK Denominated Notes Due May 2024 [Member]
Long-term debt, gross	0	20,513
Troms Offshore [Member] | USD Denominated Notes Due January 2027 [Member]
Long-term debt, gross	$ 0	$ 30,413

Note 3 - Debt - Summary of De_2

Note 3 - Debt - Summary of Debt Outstanding (Details) (Parentheticals)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Nov. 16, 2021	Jul. 31, 2017
The 8.00% Senior Secured Notes due August 2022 [Member]
Interest rate		8.00%	8.00%	8.00%
Maturity date		Aug. 31, 2022
Troms Offshore [Member] | NOK Denominated Notes Due January 2026 [Member]
Interest rate	8.50%
Maturity date	Nov. 30, 2026
Troms Offshore [Member] | NOK Denominated Notes Due May 2024 [Member]
Maturity date, start		May 31, 2024
Maturity date, end		Jan. 31, 2026
Troms Offshore [Member] | USD Denominated Notes Due January 2027 [Member]
Maturity date, start		Jan. 31, 2027
Maturity date, end		Apr. 30, 2027

Note 3 - Debt - Interest and De

Note 3 - Debt - Interest and Debt Costs Incurred, Net of Interest Capitalized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total interest and debt costs incurred	$ 15,607	$ 24,156	$ 29,068
Less: interest costs capitalized	(24)	0	0
Total interest and debt costs	$ 15,583	$ 24,156	$ 29,068

Note 4 - Investment in Uncons_3

Note 4 - Investment in Unconsolidated Affiliates (Details Textual) $ in Thousands	Apr. 22, 2021USD ($)	Jun. 22, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jan. 01, 2022
Due from Affiliate, Current				$ 70,134	$ 62,050
Assets, Current, Total				342,672	388,649
Accounts Receivable, Credit Loss Expense (Reversal)				400	52,981	$ 0
Due to Affiliate, Current				61,555	53,194
Revenue from Contract with Customer, Excluding Assessed Tax, Total				371,033	397,038	486,549
Sonatide Marine Ltd [Member]
Dividends, Total			$ 35,000
Sonatide Marine Ltd [Member] | Subsequent Event [Member]
Business Acquisition, Percentage of Voting Interests Acquired							51.00%
Sonatide Marine Ltd [Member]
Due from Affiliate, Current				49,000	41,600
Proceeds from Dividends Received		$ 17,200
Cash, Ending Balance				10,200
Accounts Receivable, after Allowance for Credit Loss, Current, Total				10,600
Assets, Current, Total				20,800
Accounts Receivable, Credit Loss Expense (Reversal)				400	40,900	$ 0
Due to Affiliate, Current				$ 40,400	$ 32,800
Number of Stacked Vessels					2
Sonatide Marine Ltd [Member] | ANGOLA
Number of Stacked Vessels				5	6	13
Revenue from Contract with Customer, Excluding Assessed Tax, Total				$ 43,200	$ 45,300	$ 52,100
Sales Revenue Services Percentage				11.90%	11.70%	10.90%
Number of Vessels				24	23	32
Sonatide Marine Ltd [Member] | Sonangol [Member]
Proceeds from Dividends Received		$ 17,800
DTDW [Member]
Accounts Receivable, Credit Loss Expense (Reversal)					$ 12,100
Number of Vessels				1
Equity Method Investment, Ownership Percentage				40.00%
Equity Method Investment, Ownership Percentage by Other Owners				60.00%
Secured Long-term Debt, Noncurrent					4,700
Guarantor Obligations, Maximum Exposure, Undiscounted					$ 2,000
Payments To Settle Debt Guarantee	$ 2,000

Note 4 - Investment in Uncons_4

Note 4 - Investment in Unconsolidated Affiliates - Related Party Transaction (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Angolan joint venture (Sonatide)	$ 70,134	$ 62,050
Sonatide	61,555	53,194
Due from affiliates, net of due to affiliates	8,579	8,856
Sonatide Marine Ltd [Member] | ANGOLA
Angolan joint venture (Sonatide)	49,011	41,623
Sonatide	40,432	32,767
DTDW [Member] | NIGERIA
Angolan joint venture (Sonatide)	21,123	20,427
Sonatide	$ 21,123	$ 20,427

Note 4 - Investment in Uncons_5

Note 4 - Investment in Unconsolidated Affiliates - Company Operations Due from Affiliates (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Less impairment of due from affiliate		$ (400)	$ (52,981)	$ 0
Sonatide Marine Ltd [Member]
Due from Sonatide at beginning of year		41,623	89,246	109,176
Revenue earned by the company through Sonatide		41,775	44,254	52,372
Less amounts received from Sonatide		(26,429)	(36,160)	(60,486)
Less amounts used to offset Due to Sonatide obligations (A)	[1]	(8,530)	(11,848)	(10,551)
Less impairment of due from affiliate		(400)	(40,900)	0
Other		972	(2,969)	(1,265)
Due from Affiliates		$ 49,011	$ 41,623	$ 89,246
[1]	We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

Note 4 - Investment in Uncons_6

Note 4 - Investment in Unconsolidated Affiliates - Company Operations Due to Affiliates (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Due to Sonatide at beginning of year		$ 32,767	$ 31,475	$ 29,347
Plus commissions payable to Sonatide		3,832	4,152	4,937
Plus amounts paid by Sonatide on behalf of the company		10,914	9,037	9,654
Less commissions paid to Sonatide		0	0	(5,961)
Less amounts used to offset Due from Sonatide obligations (A)	[1]	(8,530)	(11,848)	(10,551)
Other		1,449	(49)	4,049
Due to Affiliate		$ 40,432	$ 32,767	$ 31,475
[1]	We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

Note 5 - Income Taxes (Details

Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	May 27, 2020	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Income Tax Benefit, Cares Act			$ 6,900
Annual Limitation Of Companys Ownership Change		$ 15,000
Deferred Tax Assets, Valuation Allowance, Total		204,899	140,428
Undistributed Earnings of Foreign Subsidiaries		36,400
Unrecognized Tax Benefits, Income Tax Penalties Accrued		17,800	22,100
Foreign Tax Credits and Other Tax Attributes		322,100
Unrecognized Tax Benefits, Period Increase (Decrease), Total		6,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		29,300	35,300
Gulf Mark Offshore Inc [Member]
Annual Limitation Of Companys Ownership Change		7,000
Domestic Tax Authority [Member]
Taxable Income Limitation With Indefinite Carryover Percentage	80.00%
Operating Loss Carryforwards, Total		417,900	320,700
Domestic Tax Authority [Member] | IRC Section382 Limitation [Member]
Operating Loss Carryforwards, Total		163,700	$ 159,300
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total		160,000
Tax Credit Carryforward, Amount		$ 405,300

Note 5 - Income Taxes - Losses

Note 5 - Income Taxes - Losses Before Income Tax Domestic and Foreign (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-U.S.	$ (58,476)	$ (137,225)	$ (44,205)
United States	(65,309)	(60,436)	(69,290)
Loss before income taxes	$ (123,785)	$ (197,661)	$ (113,495)

Note 5 - Income Taxes - Compone

Note 5 - Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current, federal	$ 682	$ (21,005)	$ 649
Current, state	0	0	0
Current, non-U.S.	6,480	18,816	26,403
Current, total	7,162	(2,189)	27,052
Deferred, federal	(1,418)	(30)	672
Deferred, state	0	0	0
Deferred, non-U.S.	131	1,254	0
Deferred, total	(1,287)	1,224	672
Federal	(736)	(21,035)	1,321
State	0	0	0
Non-U.S.	6,611	20,070	26,403
Income Tax Expense (Benefit), Total	$ 5,875	$ (965)	$ 27,724

Note 5 - Income Taxes - Income

Note 5 - Income Taxes - Income Tax Expense Benefit Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Computed “expected” tax benefit	$ (25,995)	$ (41,509)	$ (23,834)
Foreign income taxed at different rates	10,984	27,639	9,283
Uncertain tax positions	(25,417)	(62,833)	5,145
Valuation allowance - deferred tax assets	34,566	43,455	15,707
Valuation allowance - deferred tax true-up	29,711	(6,523)	0
Deferred tax true-up	(29,789)	6,523	0
Foreign taxes	15,220	12,520	20,778
Return to accrual	(7,691)	11,401	(2,247)
162(m) - Executive compensation	125	286	28
Subpart F income	484	5,631	1,227
Other, net	3,677	2,445	1,637
Income Tax Expense (Benefit), Total	$ 5,875	$ (965)	$ 27,724

Note 5 - Income Taxes - Deferre

Note 5 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued employee benefit plan costs	$ 7,275	$ 8,815
Stock based compensation	649	407
Net operating loss and tax credit carryforwards	215,797	148,699
Restructuring fees not currently deductible for tax purposes	566	1,415
Disallowed business interest expense carryforward	10,386	5,546
Other	3,152	2,518
Gross deferred tax assets	237,825	167,400
Less valuation allowance	(204,899)	(140,428)
Net deferred tax assets	32,926	26,972
Depreciation and amortization	(31,745)	(25,883)
Outside basis difference deferred tax liability	(2,891)	(2,891)
Foreign interest withholding tax	(990)	(859)
Other	572	(754)
Gross deferred tax liabilities	(35,054)	(30,387)
Net deferred tax assets (liabilities)	$ (2,128)	$ (3,415)

Note 5 - Income Taxes - Uncerta

Note 5 - Income Taxes - Uncertain Tax Positions and Income Tax Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Tax liabilities for uncertain tax positions	$ 29,283	$ 35,304
Income tax payable	11,480	15,928
Income tax receivable	$ 1,322	$ 8,280

Note 5 - Income Taxes - Summary

Note 5 - Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Balance		$ 351,047	[1]	$ 414,042	[1]	$ 399,292
Additions based on tax positions related to the current year		53				14,741
Additions based on tax positions related to a prior year		18,515		2,223		1,964
Settlement and lapse of statute of limitations		(35,962)		(64,458)		(1,897)
Reductions based on tax positions related to a prior year				(760)		(58)
Balance	[1]	$ 333,653		$ 351,047		$ 414,042
[1]	The gross balance reported as uncertain tax positions is largely offset by $322.1 million of foreign tax credits and other tax attributes.

Note 6 - Leases (Details Textua

Note 6 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Payments	$ 1.8	$ 1	$ 1.4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0.3	$ 0.3	$ 0.8
Minimum [Member]
Lessee, Operating Lease, Renewal Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)	10 years

Note 6 - Leases - Operating Lea

Note 6 - Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets [Member]
Operating	$ 3,441	$ 3,372
Other Current Liabilities [Member]
Operating	1,405	1,134
Other Noncurrent Liabilities [Member]
Operating	3,301	2,668
Other Liabilities [Member]
Present value of lease liabilities	$ 4,706	$ 3,802

Note 6 - Leases - Maturity of L

Note 6 - Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2022	$ 2,205
2023	1,183
2024	741
2025	748
2026	680
After 2026	316
Total lease payments	5,873
Less: Interest	(1,167)
Other Liabilities [Member]
Present value of lease liabilities	$ 4,706	$ 3,802

Note 6 - Leases - Lease Costs (

Note 6 - Leases - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease costs	$ 1,369	$ 1,270	$ 1,336
Short-term leases	2,529	3,483	4,840
Variable lease costs	412	392	313
Sublease income	0	0	(3)
Net lease cost	$ 4,310	$ 5,145	$ 6,486

Note 6 - Leases - Lease Term an

Note 6 - Leases - Lease Term and Discount Rate (Details)	Dec. 31, 2021
Weighted average remaining lease term in years (Year)	3 years 3 months 18 days
Weighted average discount rate	7.40%

Note 7 - Assets Held for Sale_3

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments (Details Textual) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2011USD ($)
Number of Vessels, Held for Sale, Addition				7	32	46
Number of Vessels, Held for Sale, Addition,Percentage						20.00%
Number of Vessels, Held for Sale, Sold					53
Number of Vessels, Transfer from Held for Sale to Active Fleet				3	2
Number of Vessels, Held for Sale		23		18	23
Number of Active Vessels Sold				10	3
Number of Vessels Sold				9
Proceeds from Sale of Productive Assets, Total				$ 34,010	$ 38,296	$ 28,847
Proceeds from Sale of Vessels and Other Assets				34,000	38,300
Impairment of Long-Lived Assets to be Disposed of				13,700	75,200	26,700
Impairment Charge Recaptured				1,700	1,000
Asset Impairment Charges, Total				15,643	74,109	37,773
Other Assets, Total							$ 1,800
Unpaid Milestone Payments						4,000
Impairment Charge On Under Construction Asset			$ 5,800
Expense Recovered on contract to Shipyard		$ 4,000
Vessel, Obsolete Inventory [Member]
Asset Impairment Charges, Total			$ 5,200	$ 1,905	$ 2,959	$ 5,223
Third-party Operator, Family Member of Director [Member]
Proceeds from Sale of Productive Assets, Total	$ 11,400
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 4,300

Note 7 - Assets Held for Sale_4

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Beginning balance	23
Additions	7	32	46
Sales		(53)
Reactivation	(1)	0	0
Ending balance	18	23
Vessels Held for Sale [Member]
Beginning balance	23	46	0
Beginning balance	$ 34,396	$ 39,287	$ 0
Additions	7	32	46
Additions	$ 18,096	$ 97,663	$ 66,033
Sales	(9)	(53)	0
Sales	$ (15,433)	$ (26,877)	$ 0
Reactivation	(3)	(2)	0
Reactivation	$ (7,250)	$ (500)	$ 0
Impairment	$ (15,388)	$ (75,177)	$ (26,746)
Ending balance	18	23	46
Ending balance	$ 14,421	$ 34,396	$ 39,287

Note 7 - Assets Held for Sale_5

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments - Summary of Vessel Sales and Gains on Sales of Vessels (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Vessels sold from active fleet	10	3
Gain on sale of vessels	$ (2,901)	$ 7,591	$ 2,263
Vessels sold from assets held for sale		53
Total vessels sold	9
Vessels Held for Sale [Member]
Gain on sale of vessels	$ (6,209)	$ 6,384	$ 0
Vessels sold from assets held for sale	9	53	0
Vessels, Active Fleet [Member]
Vessels sold from active fleet	10	3	40
Gain on sale of vessels	$ 3,499	$ 1,217	$ 2,434
Vessel [Member]
Gain on sale of vessels	$ (2,710)	$ 7,601	$ 2,434
Total vessels sold	19	56	40

Note 7 - Assets Held for Sale_6

Note 7 - Assets Held for Sale, Asset Sales and Asset Impairments - Summary of Impairment of Vessels (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Impairment and other expense		$ 15,643	$ 74,109	$ 37,773
Reactivation of asset held for sale		1	0	0
Vessel, Obsolete Inventory [Member]
Impairment and other expense	$ 5,200	$ 1,905	$ 2,959	$ 5,223
Obsolete inventory		0	0	0
Vessel, Other [Member]
Other		0	0	0
Other, impairment		$ 0	$ (4,027)	$ 5,804
Vessels Held for Sale [Member]
Assets held for sale		8	47	35
Impairment and other expense		$ 15,388	$ 75,177	$ 26,746
Reactivation of asset held for sale		3	2	0
Reactivation of asset held for sale		$ 1,650	$ 0	$ 0

Note 8 - Employee Retirement _3

Note 8 - Employee Retirement Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands	2 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 1,603	$ 1,615	$ 5,027
Defined Benefit Plan Concentration Risk Assets Equity Securities Difference Plan Assets And Liabilities	25.00%	25.00%
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.85%	2.85%	2.50%
Defined Contribution Plan Company Contribution Percentage		3.00%
Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 0	1,100
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 1,600	$ 1,600	$ 3,200
Retirement Plans Contributions [Member]
Defined Contribution Plan Company Contribution Vesting Period (Year)		5 years
Defined Contribution Saving Plan, A401 K [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 100
Defined Contribution Plan, Percent, Contributed By Employee Minimum		2.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		75.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Benefit Plan, Plan Assets, Employer, Related Party, Number of Shares (in shares)	0	0	0
Multinational Retirement Plan [Member]
Defined Contribution Plan, Percent, Contributed By Employee Minimum		1.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		50.00%
Merchant Navy Officers Pension Fund [Member]
Postemployment Benefits Liability, Total	$ 900	$ 900	$ 700
Postemployment Benefits, Period Expense		$ 200

Note 8 - Employee Retirement _4

Note 8 - Employee Retirement Plans - Allocation of Plan Assets (Details) - UNITED STATES	Dec. 31, 2021	Dec. 31, 2020
Target Allocation	100.00%
Weighted Average Allocation	100.00%	100.00%
Defined Benefit Plan, Cash [Member]
Target Allocation	0.00%
Weighted Average Allocation	2.00%	3.00%
Defined Benefit Plan, Debt Security [Member]
Target Allocation	50.00%
Weighted Average Allocation	34.00%	53.00%
Defined Benefit Plan, Equity Securities [Member]
Target Allocation	50.00%
Weighted Average Allocation	64.00%	44.00%

Note 8 - Employee Retirement _5

Note 8 - Employee Retirement Plans - Pension Plan Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair value of plan assets	$ 56,779	$ 56,495	$ 59,625	$ 56,790
Pension Plan [Member] | Change In Plan Assets [Member]
Fair value of plan assets	56,779	56,495
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Change In Plan Assets [Member]
Fair value of plan assets	55,868	39,705
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Change In Plan Assets [Member]
Fair value of plan assets	911	1,626
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Change In Plan Assets [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Change In Plan Assets [Member]
Fair value of plan assets	0	15,164
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	36,240	24,947
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	36,240	21,780
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	3,167
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	19,628	29,922
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	19,628	17,925
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Debt Security [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	0	11,997
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	911	1,626
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	911	1,626
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Pension Plan [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Fair value of plan assets	$ 0	$ 0

Note 8 - Employee Retirement _6

Note 8 - Employee Retirement Plans - Net Funded Status (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Benefit obligation at beginning of the period		$ 88,960	$ 91,654	$ 90,247
Service cost		0	112	427
Interest cost		2,168	2,907	3,751
Benefits paid		(5,693)	(5,990)	(5,967)
Actuarial (gain) loss (A)	[1]	(1,127)	5,277	8,198
Settlement		0	(4,407)	(4,978)
Foreign currency exchange rate changes		0	(593)	(24)
Benefit obligation at end of the period		84,308	88,960	91,654
Fair value of plan assets at beginning of the period		56,495	59,625	56,790
Actual return		4,374	6,890	7,498
Actuarial loss		0	18	983
Administrative expenses		0	(49)	(68)
Defined Benefit Plan, Plan Assets, Contributions by Employer		1,603	1,615	5,027
Benefits paid		(5,693)	(5,990)	(5,967)
Settlement		0	(5,000)	(4,638)
Foreign currency exchange rate changes		0	(614)	0
Fair value of plan assets at end of the period		56,779	56,495	59,625
Unfunded status at end of the period		(27,529)	(32,465)	(32,029)
Current liabilities		(1,578)	(1,524)	(1,422)
Noncurrent liabilities		(25,951)	(30,941)	(30,607)
Net amount recognized		$ (27,529)	$ (32,465)	$ (32,029)
[1]	The change in the actuarial (gain) loss for the three years ended December 31, 2021 was primarily attributable to changes in the discount rate.

Note 8 - Employee Retirement _7

Note 8 - Employee Retirement Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Projected and accumulated benefit obligation	$ 84,308	$ 88,960	$ 91,654	$ 90,247
Fair value of plan assets	$ 56,779	$ 56,495	$ 59,625	$ 56,790

Note 8 - Employee Retirement _8

Note 8 - Employee Retirement Plans - Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest cost	$ 2,168	$ 2,907	$ 3,751
Administrational expenses	0	49	68
Pension Plan And Supplemental Plan [Member]
Service cost	0	109	427
Interest cost	2,168	2,907	3,751
Expected return on plan assets	(2,174)	(2,191)	(2,375)
Administrational expenses	0	49	71
Payroll tax of net pension costs	0	14	55
Amortization of net actuarial losses	145	(5)	(592)
Settlement/curtailment (gain) loss	0	738	(219)
Net periodic pension cost	$ 139	$ 1,621	$ 1,118

Note 8 - Employee Retirement _9

Note 8 - Employee Retirement Plans - Amounts Recognized In Other Comprehensive Income Loss (Details) - Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net (gain) loss	$ (3,472)	$ (568)	$ 2,612
Settlement recognized	0	0	(182)
Total recognized in other comprehensive (income) loss, before tax and net of tax	$ (3,472)	$ (568)	$ 2,430

Note 8 - Employee Retirement_10

Note 8 - Employee Retirement Plans - Assumptions of Net Periodic Costs (Details) - Pension Plan [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Discount rate	2.50%	3.50%
Expected long-term rate of return on assets	4.00%	4.00%
Rates of annual increase in compensation levels		2.30%

Note 8 - Employee Retirement_11

Note 8 - Employee Retirement Plans - Expected Benefit Payments (Details) $ in Thousands	Dec. 31, 2021USD ($)
2022	$ 5,911
2023	5,863
2024	5,816
2025	5,746
2026	5,648
2027 – 2031	26,188
Total 10-year estimated future benefit payments	$ 55,172

Note 9 - Stock-based Compensa_3

Note 9 - Stock-based Compensation and Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value	$ 4,460	$ 6,395	$ 19,193
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	3,300	4,700	6,300
Employee Service Sharebased Compensation Nonvested Awards Compensation Cost Not Yet Recognized Net Of Tax	$ 2,600	$ 3,700	5,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years
Restricted Stock Units (RSUs) [Member] | Time Based Shares [Member] | During Fiscal 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)	299,000
Phantom Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value			$ 1,100
A2017 Incentive Plan [Member] | Plan Of Reorganization [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
A2017 Incentive Plan [Member] | Plan Of Reorganization [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		603,756
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	488,890
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 11.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	8 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	114,866
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	0
Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,200
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)	$ 3.23
Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)	$ 3.69

Note 9 - Stock-based Compensa_4

Note 9 - Stock-based Compensation and Incentive Plans - Common Stock Shares Reserved for Issuance and Shares Available for Grant (Details) - shares	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares of common stock reserved for issuance under the plans (in shares)	6,473,228	3,973,228	3,973,228
Shares of common stock available for future grants (in shares)	3,037,187	1,591,577	2,187,101

Note 9 - Stock-based Compensa_5

Note 9 - Stock-based Compensation and Incentive Plans - Share based Compensation Restricted Stock and Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Time Based Shares [Member]
Balance (in dollars per share)	$ 8.95	$ 23.32	$ 24.21
Balance (in shares)	732,083	403,768	1,081,084
Granted (in dollars per share)	$ 13.26	$ 5.95	$ 23.44
Granted (in shares)	452,403	594,234	186,143
Vested (in dollars per share)	$ 10.97	$ 24.05	$ 24.45
Vested (in shares)	(406,604)	(265,919)	(784,868)
Cancelled/forfeited (in dollars per share)	$ 24.50		$ 24.70
Cancelled/forfeited (in shares)	(1,769)		(78,591)
Balance (in dollars per share)	$ 10.37	$ 8.95	$ 23.32
Balance (in shares)	776,113	732,083	403,768
Performance Based Shares [Member]
Balance (in dollars per share)	$ 24.50	$ 25.54	$ 26.04
Balance (in shares)	30,449	93,814	63,365
Granted (in dollars per share)	$ 0	$ 0	$ 24.50
Granted (in shares)	0	0	101,143
Vested (in dollars per share)	$ 0	$ 26.04	$ 0
Vested (in shares)	0	(63,365)	0
Cancelled/forfeited (in dollars per share)	$ 0		$ 24.50
Cancelled/forfeited (in shares)	0		(70,694)
Balance (in dollars per share)	$ 24.50	$ 24.50	$ 25.54
Balance (in shares)	30,449	30,449	93,814

Note 9 - Stock-based Compensa_6

Note 9 - Stock-based Compensation and Incentive Plans - Allocated Share based Compensation Expense Recognized Period Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value	$ 4,460	$ 6,395	$ 19,193
Restricted Stock Units (RSUs) [Member]
Restricted stock unit compensation expense	$ 5,638	$ 5,117	$ 19,603

Note 9 - Stock-based Compensa_7

Note 9 - Stock-based Compensation and Incentive Plans - Nonvested Restricted Stock Units Activity (Details) - Phantom Stock Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Series A Warrants [Member]
Balance (in dollars per share)	$ 0	$ 1
Balance (in shares)	0	7,650
Vested (in dollars per share)		$ 1
Vested (in shares)		(7,650)
Series B Warrants [Member]
Balance (in dollars per share)	$ 0	$ 2.94
Balance (in shares)	0	8,269
Vested (in dollars per share)		$ 2.94
Vested (in shares)		(8,269)
Time Based Restricted Stock Awards [Member]
Balance (in dollars per share)	$ 0	$ 226.50
Balance (in shares)	0	4,517
Vested (in dollars per share)		$ 226.50
Vested (in shares)		(4,517)

Note 10 - Stockholders' Equit_2

Note 10 - Stockholders' Equity (Details Textual) - USD ($)	Nov. 16, 2021	Jul. 13, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Stock Repurchased During Period, Shares (in shares)			0	0	0
Dividends, Common Stock, Cash			$ 0	$ 0	$ 0
Class Of Warrant Or Right, Issued During Period (in shares)						11,543,814
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001	$ 0.001
At-the-market Sales Agreement [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001
Maximum Aggregate Offering Price	$ 30,000,000
Maximum Percentage of Gross Proceeds Form Each Sale of Shares, Commission	3.00%
Shelf Registration [Member]
Maximum Aggregate Offering Price		$ 300,000,000
Series A Warrants [Member]
Class Of Warrant Or Right, Issued During Period (in shares)						2,432,432
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 57.06
Class of Warrant or Right, Exercised During Period (in shares)						0
Series B Warrants [Member]
Class Of Warrant Or Right, Issued During Period (in shares)						2,629,657
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 62.28
Class of Warrant or Right, Exercised During Period (in shares)						0
New Creditor Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			635,663
Class Of Warrant Or Right, Assumed During Period (in shares)			2,300,000
Equity Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 100
Class Of Warrant Or Right, Assumed During Period (in shares)			800,000
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)			1.1
GLF Equity Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)			0
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)			559,125

Note 10 - Stockholders' Equit_3

Note 10 - Stockholders' Equity - Stock by Class (Details) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Common stock shares authorized (in shares)	125,000,000	125,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Common stock shares issued (in shares)	41,307,617	40,704,984
Preferred stock shares authorized (in shares)	3,000,000	3,000,000
Preferred stock par value (in dollars per share)	$ 0	$ 0
Preferred stock shares issued (in shares)	0	0

Note 10 - Stockholders' Equit_4

Note 10 - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at December 31	$ 823,272	$ 1,016,410	$ 1,144,923
Balance at December 31	701,769	823,272	1,016,410
AOCI Attributable to Parent [Member]
Balance at December 31	(804)	(236)	2,194
Balance at December 31	2,668	(804)	(236)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Before reclassifications	$ 3,472	$ (568)	$ (2,430)

Note 12 - Accrued Expenses, O_3

Note 12 - Accrued Expenses, Other Current Liabilities, and Other Liabilities - Summary of Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Payroll and related payables	$ 18,627	$ 17,201
Accrued vessel expenses	19,662	17,129
Accrued interest expense	1,859	3,240
Other accrued expenses	11,586	14,852
Accrued Liabilities, Current, Total	51,734	52,422
Taxes payable	18,977	23,883
Other	4,888	8,902
Other Liabilities, Current, Total	$ 23,865	$ 32,785

Note 12 - Accrued Expenses, O_4

Note 12 - Accrued Expenses, Other Current Liabilities and Other Liabilities - Other liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pension liabilities	$ 26,872	$ 31,736
Liability for uncertain tax positions	29,283	35,304
Other	12,029	12,752
Other Liabilities, Noncurrent, Total	$ 68,184	$ 79,792

Note 13 - Segment Information_3

Note 13 - Segment Information, Geographical Data and Major Customers - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 371,033	$ 397,038	$ 486,549
Corporate expenses	466,049	583,840	573,153
Gain (loss) on asset dispositions, net	(2,901)	7,591	2,263
Affiliate credit loss impairment expense	(400)	(52,981)	0
Affiliate guarantee obligation	0	(2,000)	0
Asset impairments and other	(15,643)	(74,109)	(37,773)
Operating loss	(95,016)	(186,802)	(86,604)
Depreciation and amortization	114,544	116,709	101,931
Property Plant And Equipment Additions	8,951	14,900	17,998
Total Assets	1,095,780	1,251,177	1,579,528
Vessel [Member]
Revenue	361,569	386,174	477,015
Product and Service, Other [Member]
Revenue	9,464	10,864	9,534
Operating Segments [Member]
Gross Profit	(39,164)	(29,670)	6,894
Operating Segments [Member] | Vessel [Member]
Gross Profit	(46,397)	(37,128)	160
Operating Segments [Member] | Product and Service, Other [Member]
Revenue	9,464	10,864	9,534
Gross Profit	7,233	7,458	6,734
Operating Segments [Member] | Americas [Member]
Depreciation and amortization	30,856	32,079	27,493
Property Plant And Equipment Additions	0	2,842	969
Total Assets	278,394	338,649	375,297
Operating Segments [Member] | Americas [Member] | Vessel [Member]
Revenue	102,151	126,676	136,958
Gross Profit	(11,270)	4,944	(805)
Operating Segments [Member] | Middle East and Asia Pacific [Member]
Depreciation and amortization	25,992	24,244	21,440
Property Plant And Equipment Additions	(42)	2,629	5,237
Total Assets	183,287	226,422	270,413
Operating Segments [Member] | Middle East and Asia Pacific [Member] | Vessel [Member]
Revenue	102,537	97,133	90,321
Gross Profit	(1,174)	(5,935)	(6,044)
Operating Segments [Member] | Europe and Mediterranean [Member]
Depreciation and amortization	28,163	29,222	30,053
Property Plant And Equipment Additions	764	1,059	4,001
Total Assets	293,760	302,214	358,943
Operating Segments [Member] | Europe and Mediterranean [Member] | Vessel [Member]
Revenue	80,914	83,602	123,711
Gross Profit	(16,968)	(8,629)	(1,289)
Operating Segments [Member] | West Africa [Member]
Depreciation and amortization	26,196	27,787	21,166
Property Plant And Equipment Additions	6,341	6,028	2,721
Total Assets	223,988	242,825	376,087
Operating Segments [Member] | West Africa [Member] | Vessel [Member]
Revenue	75,967	78,763	126,025
Gross Profit	(16,985)	(27,508)	8,298
Corporate, Non-Segment [Member]
Corporate expenses	(36,908)	(35,633)	(57,988)
Depreciation and amortization	3,337	3,377	1,779
Property Plant And Equipment Additions	1,888	2,342	5,070
Total Assets	$ 116,351	$ 141,067	$ 198,788

Note 13 - Segment Information_4

Note 13 - Segment Information, Geographical Data and Major Customers - Entity Wide Major Customer (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Chevron Corporation [Member]
Concentration Risk, Percentage	15.70%	14.30%	13.00%
Saudi Aramco [Member]
Concentration Risk, Percentage	11.80%	11.50%

Note 14 - Restructuring Charg_3

Note 14 - Restructuring Charges (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Exit Costs And Severance Charges	$ 0.2	$ 1.5	$ 6.8

Note 14 - Restructuring Charg_4

Note 14 - Restructuring Charges - Activity for Lease Exit and Severance Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 3,335	$ 4,381
Charges	174	1,501
Cash payments	(2,000)	(2,547)
Balance	1,509	3,335
Lease Exit [Member]
Balance	1,556	1,791
Charges	96	71
Cash payments	(505)	(306)
Balance	1,147	1,556
Lease Exit [Member] | Corporate, Non-Segment [Member]
Balance	1,779	2,318
Charges	78	63
Cash payments	(1,495)	(602)
Balance	362	1,779
Employee Severance [Member]
Balance	0	272
Charges	0	1,367
Cash payments	0	(1,639)
Balance	$ 0	$ 0

Note 15 - Subsequent Event (Det

Note 15 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2022USD ($)	Jun. 30, 2022USD ($)$ / sharesshares	Dec. 31, 2017shares
Class Of Warrant Or Right, Issued During Period (in shares) | shares			11,543,814
Forecast [Member] | Warrans Issued to Acquire Swire Pacific Offshore Holdings Ltd. [Member]
Class Of Warrant Or Right, Issued During Period (in shares) | shares		8,100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.001
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares		1
Sonatide [Member] | Subsequent Event [Member]
Business Acquisition, Percentage of Voting Interests Acquired	51.00%
Payments to Acquire Businesses, Gross | $	$ 11,200
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	49.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $	$ 0
Swire Pacific Offshore Holdings Ltd. [Member] | Forecast [Member]
Business Combination, Offshore Support Vessels Acquired		50
Business Combination, Consideration Transferred, Total | $		$ 42,000