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Note J - Fair Value of Financial Instruments - Securities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable equity securities | $ 25,157 | $ 29,521
Fair Value, Inputs, Level 1 [Member] |  |
Marketable equity securities | 25,157 |
Fair Value, Inputs, Level 2 [Member] |  |
Marketable equity securities | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Marketable equity securities | $ 0 |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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