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Note 9 - Fair Value | 9 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | 9. FAIR VALUE ​ The fair values of financial instruments were as follows (dollars in millions): ​
|  | September 30, 2023 |  |  | December 31, 2022 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | value |  |  | fair value |  |  | value |  |  | fair value |
Non-qualified employee benefit plan investments |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | 15 |
Investment in Venator |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | 5 |
Long-term debt (including current portion) |  |  | (1,606 | ) |  |  | (1,455 | ) |  |  | (1,737 | ) |  |  | (1,578 | )
​ The carrying amounts reported in the balance sheets of cash and cash equivalents, accounts receivable and accounts payable approximate fair value because of the immediate or short-term maturity of these financial instruments. The fair values of non-qualified employee benefit plan investments are obtained through market observable pricing using prevailing market prices (Level 1). The estimated fair values of our long-term debt are based on quoted market prices for the identical liability when traded in an active market (Level 1). Our investment in Venator is marked to fair value, which is obtained through market observable pricing using prevailing market prices (Level 1). The fair value estimates presented herein are based on pertinent information available to management as of September 30, 2023 and December 31, 2022. Although we are not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since September 30, 2023, and current estimates of fair value may differ significantly from the amounts presented herein. ​ During the nine months ended September 30, 2023, we held no instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3), and there were no gains or losses (realized and unrealized) included in our earnings for instruments categorized as Level 3 within the fair value hierarchy. ​

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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