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Note J - Fair Value of Financial Instruments - Securities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Marketable equity securities	$ 23,207	$ 29,521
Fair Value, Inputs, Level 1 [Member]
Marketable equity securities	23,207
Fair Value, Inputs, Level 2 [Member]
Marketable equity securities
Fair Value, Inputs, Level 3 [Member]
Marketable equity securities

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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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