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Note 15 - Fair Value Disclosure of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable equity securities |  | $ 9,045 | $ 11,936
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Real estate |  | 99,693 | 108,313
Investments in real estate joint ventures | [1] | 62,429 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Real estate |  |  |
Investments in real estate joint ventures | [1] |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Real estate |  |  |
Investments in real estate joint ventures | [1] |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Real estate |  | 99,693 | 108,313
Investments in real estate joint ventures | [1] | 62,429 |
Fair Value, Measurements, Recurring [Member] |  |  |
Marketable equity securities |  | 9,045 | 11,936
Interest rate swaps |  |  | 344
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Marketable equity securities |  | 9,045 | 11,936
Interest rate swaps |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Marketable equity securities |  |  |
Interest rate swaps |  |  | 344
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Marketable equity securities |  |  |
Interest rate swaps |  |  |
[1] | Fair value measurement as of date of deconsolidation. See Footnotes 5 and 7 to the Notes to the Consolidated Financial Statements.

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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=66022186&loc=d3e32014-111567 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
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