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Note 15 - Noncontrolling Interests and Redeemable Noncontrolling Interests (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2007 USD ($) shares | Dec. 31, 2006 USD ($) $ / shares shares
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | $ 149 |  |  |  | $ 109 |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total |  | 15,784 |  | $ 17,943 |  | 23,682 |  |
Payments to Noncontrolling Interests |  | 20,600 |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | [1] | (0) |  | 5,752 |  |  |  |
Adjustments to Additional Paid in Capital, Other |  | 19,300 |  |  |  |  |  |
Noncontrolling Interest, Change in Redemption Value |  | $ (2,160) | [2] | 0 | [2] | $ 7,521 |  |
Measurement Input, Cap Rate [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Fair Value, Measurement Input |  | 5.50 |  |  |  |  |  |
Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Fair Value, Measurement Input |  | 6.50 |  |  |  |  |  |
Convertible Units [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  |  |  |  |  |  |  | $ 5,300
Non-controlling Interest, Units (in shares) | shares |  |  |  |  |  |  |  | 138,015
Convertible Units [Member] | Fair Market Value Adjustments [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  |  |  |  |  |  |  | $ 300
Capital Units, Class B [Member] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total |  | $ 16,100 |  | $ 16,200 |  |  |  |
Non-controlling Interest, Units Issued (in shares) | shares |  |  |  |  |  |  |  | 647,758
Non-controlling Interest, Par Value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 37.24
Redeemable Units to Company Common Stock, Ratio |  |  |  |  |  |  |  | 1
Non-controlling Interest, Units Redeemed (in shares) | shares |  |  |  | 188,951 |  | 25,970 | 30,000 |
Non-controlling Interest, Cumulative Par Value |  |  |  | $ 8,000 |  | $ 1,100 | $ 1,100 |
Cash Paid to Noncontrolling Interests to Settle Capital Units |  |  |  | 4,000 |  | 500 |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | 149 |  |  |  | $ 109 |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | $ 1,300 |  |  |  |  |  |
Class A Units [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  | $ 5,800 |  |  |  |
Minority Interest, Units Redeemed (in shares) | shares |  |  |  | 5,223,313 |  |  |  |
PUERTO RICO |  |  |  |  |  |  |  |
Number of Real Estate Properties |  | 7 |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | $ 233,000 |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total |  | 5,200 |  | $ 5,200 |  |  |  |
PUERTO RICO | Fair Market Value Adjustments [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | 15,100 |  |  |  |  |  |
PUERTO RICO | Non-convertible Units [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | 158,600 |  |  |  |  |  |
PUERTO RICO | Convertible Units [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | 45,800 |  |  |  |  |  |
PUERTO RICO | Premiums [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance |  | $ 13,500 |  |  |  |  |  |
[1] | During 2019, the Company redeemed all 5,223,313 Class A Units for a total redemption price of $5.8 million.
[2] | During the year ended December 31, 2020, the Company recorded an adjustment of $2.2 million to the estimated redemption fair market value of this noncontrolling interest in accordance with the provisions of the joint venture agreement and ASC 480 – Accounting for Redeemable Equity Instruments. The Company assesses the fair market value of this noncontrolling interest on a recurring basis and determined that its valuation was classified within Level 3 of the fair value hierarchy. The estimated fair market value of this noncontrolling interest was based upon a discounted cash flow model, for which a capitalization rate of 5.50% and discount rate of 6.50% were utilized in the model based upon unobservable rates that the Company believes to be within a reasonable range of current market rates. No adjustment to fair value was required during the year ended December 31, 2019.

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