Note 4 - Mortgage and Other Indebtedness (Details) - Consolidated Indebtedness by Type of Debt (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	$ 871,334	$ 857,144
Line of Credit [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	145,000	145,000
Unsecured Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	230,000	230,000
Construction Loans [Member] | Variable Rate Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	164,158	144,389
Mortgages [Member] | Variable Rate Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	60,871	61,185
Mortgages [Member] | Fixed Rate Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	271,242	276,504
Net Premiums On Acquired Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	63	66
Fixed Rate Debt [Member]
Participating Mortgage Loans [Line Items]
Mortgage and other indebtedness	$ 271,242