Note 15 - Noncontrolling Interests and Redeemable Noncontrolling Interests (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
		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.