Note 8 - Notes and Mortgage Payable - Medium Term Note Repayments (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016		Aug. 31, 2016	May 31, 2016
Canadian Notes Payable [Member]
Repayments of Long-term Debt	[1]	$ 270.9
Unsecured Debt [Member]
Repayments of Long-term Debt	[2]	$ 290.9
Debt Instrument, Interest Rate, Stated Percentage		5.70%	[2]	2.80%	4.25%
Medium-term Notes [Member]
Repayments of Long-term Debt		$ 300.0
Debt Instrument, Interest Rate, Stated Percentage		5.783%

[1] On August 26, 2016, the redemption date, the Company repaid (i) its Canadian denominated (“CAD”) $150.0 million 5.99% notes, which were scheduled to mature in April 2018 and (ii) its CAD $200.0 million 3.855% notes, which were scheduled to mature in August 2020. The Company recorded aggregate early extinguishment of debt charges of CAD $34.1 million (USD $26.3 million) resulting from the early repayment of these notes.

[2] The Company recorded a prepayment charge of $10.2 million resulting from the early repayment of this note.