Note 10 - Notes, Mortgages and Construction Loan Payable - Repaid Notes (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Senior Unsecured Note [Member]
Amount repaid	$ 300.0	[1]
Interest rate	6.875%	[1]
Maturity date	Oct. 31, 2019	[1]
Senior Unsecured Notes 1 [Member]
Amount repaid	$ 15.1	[2]
Interest rate	3.20%	[2]
Maturity date	May 31, 2021	[2]

[1] The Company recorded an early extinguishment of debt charge of $12.8 million resulting from the early repayment of these notes.

[2] As of September 30, 2018, these notes had an outstanding balance of $484.9 million.