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Note 4 - Fair Value Measurements - Financial Instruments Fair Value (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Reported Value Measurement [Member] |  |  |
Cash and cash equivalents |  | $ 22,417,000 | $ 34,869,000
Senior notes (a) | [1] | 225,000,000 | 0
Estimate of Fair Value Measurement [Member] |  |  |
Cash and cash equivalents |  | 22,417,000 | 34,869,000
Senior notes (a) | [1] | $ 225,000,000 | $ 0
[1] | Fair value is determined using Level 2 inputs. The Company’s senior unsecured notes are quoted, but not actively traded on major exchanges; therefore, fair value is based on periodic values as quoted on major exchanges. See Note 7 for additional information.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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Balance Type: | debit
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
Period Type: |