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Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($) | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Oct. 01, 2020
--- | --- | --- | --- | --- | --- | ---
Marketable securities | $ 0 |  |  |  |  |
Fair value (millions) | 2,600 | $ 4,700 | $ 7,200 | $ 7,100 | $ 6,700 | $ 4,000.0
Fair Value, Recurring [Member] | Reported Value Measurement [Member] |  |  |  |  |  |
Cash equivalents | 20,110,000 |  |  | 54,104,000 |  |
Marketable securities | 0 |  |  | 5,140,000 |  |
Fair value (millions) | 2,610,000 |  |  | 7,050,000 |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Cash equivalents | 20,110,000 |  |  | 54,104,000 |  |
Marketable securities | 0 |  |  | 5,140,000 |  |
Fair value (millions) | 0 |  |  | 0 |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |
Marketable securities | 0 |  |  | 0 |  |
Fair value (millions) | 0 |  |  | 0 |  |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |  |
Marketable securities | 0 |  |  | 0 |  |
Fair value (millions) | $ 2,610,000 |  |  | $ 7,050,000 |  |

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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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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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