XML 27 R14.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Marketable Securities | 12 Months Ended
--- | ---
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | Note 6 – Marketable securities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unrealized
​ | ​ | Market value | ​ | Cost basis | ​ | gains, net
​ | ​ | (In millions)
December 31, 2020: |  | ​ |  |  | ​ |  |  | ​ |
Current assets | ​ | $ | 4.4 | ​ | $ | 4.4 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets | ​ | $ | 2.9 | ​ | $ | 2.9 | ​ | $ | —
December 31, 2021: | ​ |  |  | ​ |  |  | ​ |  |
Current assets | ​ | $ | 2.6 | ​ | $ | 2.6 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets | ​ | $ | 3.3 | ​ | $ | 3.3 | ​ | $ | —
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ | ​ | ​ | ​ | ​ | Quoted | ​ | Significant
​ | ​ | ​ | ​ | ​ | Prices in | ​ | Other
​ | ​ | ​ | ​ | ​ | Active | ​ | Observable
​ | ​ | ​ | ​ | ​ | Markets | ​ | Inputs
​ |  | Total |  | (Level 1) |  | (Level 2)
​ | ​ | (In millions)
December 31, 2020: |  | ​ |  |  | ​ |  |  | ​ |
Current assets | ​ | $ | 4.4 | ​ | $ | — | ​ | $ | 4.4
Noncurrent assets: | ​ |  |  | ​ |  |  | ​ |  |
Fixed income securities | ​ | $ | 2.7 | ​ | $ | — | ​ | $ | 2.7
Common stocks | ​ |  | .2 | ​ |  | .2 | ​ |  | —
Total | ​ | $ | 2.9 | ​ | $ | .2 | ​ | $ | 2.7
December 31, 2021: | ​ |  |  | ​ |  |  | ​ |  |
Current assets | ​ | $ | 2.6 | ​ | $ | — | ​ | $ | 2.6
Noncurrent assets: | ​ |  |  | ​ |  |  | ​ |  |
Fixed income securities | ​ | $ | 1.3 | ​ | $ | — | ​ | $ | 1.3
Mutual funds | ​ |  | 2.0 | ​ |  | 2.0 | ​ |  | —
Total | ​ | $ | 3.3 | ​ | $ | 2.0 | ​ | $ | 1.3
​ Other. The fair value of our marketable securities are either determined using Level 1 inputs (because the securities are actively traded) or determined using Level 2 inputs (because although these securities are traded, in many cases the market is not active and the year-end valuation is generally based on the last trade of the year, which may be several days prior to December 31).

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
Name: | us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration