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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II TIDEWATER INC. AND SUBSIDIARIES Valuation and Qualifying Accounts (In thousands)
|  |  |  |  |  |  |  |  |  |  |  |  |  | Balance |
|  | Balance at |  |  |  |  |  |  |  |  |  |  | at |
|  | Beginning |  |  | Additions |  |  |  |  |  |  | End of |
Description |  | of period |  |  | at Cost |  |  | Deductions |  |  | Period |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,800 |  |  |  | 900 |  |  |  | — |  |  |  | 2,700 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,700 |  |  |  | — |  |  |  | 2,630 |  |  |  | 70 |
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deducted in balance sheet from trade accounts receivables: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 70 |  |  |  | 1,446 |  |  |  | — |  |  |  | 1,516 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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