Note 14 - Noncontrolling Interests/Redeemable Noncontrolling Interests (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019 USD ($) shares		Dec. 31, 2018 USD ($) shares		Dec. 31, 2017 USD ($)	Dec. 31, 2007 USD ($) shares	Dec. 31, 2006 USD ($) $ / shares shares
Noncontrolling Interest, Increase from Subsidiary Equity Issuance				$ 109		$ 48,877
Redeemable Noncontrolling Interest, Equity, Carrying Amount, Total		$ 17,943		23,682		16,143
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	[1]	5,752		(0)
Noncontrolling Interest, Change in Redemption Value		0	[2]	$ 7,521	[2]	$ 0
Measurement Input, Cap Rate [Member]
Noncontrolling Interest, Fair Value, Measurement Input				5.00
Measurement Input, Discount Rate [Member]
Noncontrolling Interest, Fair Value, Measurement Input				6.00
Convertible Units [Member]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance								$ 5,300
Non-controlling Interest, Units | 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		$ 16,200		$ 24,300
Non-controlling Interest, Units Issued | shares								647,758
Non-controlling Interest, Par Value | $ / shares								$ 37.24
Redeemable Units to Company Common Stock, Ratio								1
Non-controlling Interest, Units Redeemed | 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
Class A Units [Member]
Minority Interest, Units Redeemed | shares		5,223,313
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		$ 5,800
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, 2018, the Company recorded an adjustment of $7.5 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 revalues 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 5.00% and discount rate of 6.00% 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.