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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Marketable Securities, Gain (Loss), Total | $ 61,085 | $ (4,667)
Payment, Tax Withholding, Share-based Payment Arrangement | 9,082 | 5,149
Proceeds from Change in Tenants' Security Deposits | 650 | 70
Increase (Decrease) in Other Operating Assets, Total | $ 34,936 | 29,454
Revision of Prior Period, Reclassification, Adjustment [Member] |  |
Marketable Securities, Gain (Loss), Total |  | 4,700
Proceeds from (Payments for) Other Financing Activities |  | (5,100)
Payment, Tax Withholding, Share-based Payment Arrangement |  | 5,100
Proceeds from Change in Tenants' Security Deposits |  | 100
Increase (Decrease) in Other Operating Assets, Total |  | (4,700)
Other Income |  | $ (4,700)

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