Note 6 - Variable Interest Entities ("VIE") - Summary of Restricted Assets and VIE Liabilities (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Restricted Assets:
Real estate, net	$ 630,900,000	$ 326,900,000
Cash and cash equivalents	10,500,000	3,800,000
Accounts and notes receivable, net	2,800,000	1,600,000
Other assets	3,000,000	1,400,000
Total Restricted Assets	647,230,000	333,705,000
VIE Liabilities:
Mortgages payable, net	341,400,000	138,600,000
Other liabilities	66,700,000	37,600,000
Total VIE Liabilities	$ 408,112,000	$ 176,216,000