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, 2019	Dec. 31, 2018
Fair Value, Nonrecurring [Member]
Real estate		$ 39,510	$ 99,693
Other real estate investments		32,974
Investments in real estate joint ventures (1)	[1]		62,429
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Real estate		0	0
Other real estate investments		0
Investments in real estate joint ventures (1)	[1]		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Real estate		0	0
Other real estate investments		0
Investments in real estate joint ventures (1)	[1]		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Real estate		39,510	99,693
Other real estate investments		32,974
Investments in real estate joint ventures (1)	[1]		62,429
Fair Value, Recurring [Member]
Marketable equity securities (1)	[2]	9,353	9,045
Marketable equity securities (1)	[2]	9,353	9,045
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Marketable equity securities (1)	[2]	9,353	9,045
Marketable equity securities (1)	[2]	9,353	9,045
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Marketable equity securities (1)	[2]	0
Marketable equity securities (1)	[2]	$ 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Marketable equity securities (1)	[2]		0
Marketable equity securities (1)	[2]		$ 0

[1] Fair value measurement as of date of deconsolidation. See Footnotes 5 and 7 to the Notes to the Consolidated Financial Statements.

[2] Included in Other Assets on the Company's Consolidated Balance Sheets.