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Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Recurring [Member] |  |  |
Marketable equity securities |  | $ 10,665 | $ 9,045
Marketable equity securities |  | 10,665 | 9,045
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Marketable equity securities |  | 10,665 | 9,045
Marketable equity securities |  | 10,665 | 9,045
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Marketable equity securities |  | 0 | 0
Marketable equity securities |  | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Marketable equity securities |  |  | 0
Marketable equity securities |  |  | 0
Fair Value, Nonrecurring [Member] |  |  |
Real estate |  | 78,700 | 99,693
Investments in real estate joint ventures | [1] |  | 62,429
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Real estate |  | 0 | 0
Investments in real estate joint ventures | [1] |  | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Real estate |  | 0 | 0
Investments in real estate joint ventures | [1] |  | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Real estate |  | $ 78,700 | 99,693
Investments in real estate joint ventures | [1] |  | $ 62,429
[1] | Fair value measurement as of date of deconsolidation.

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- Definition The fair value of real estate. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567 + Details
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