Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details) - Preferred Stock Redeemed - Series H Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	[1]
Note 16 - Preferred Stock, Common Stock and Convertible Unit Transactions (Details) - Preferred Stock Redeemed [Line Items]
Series H (1)	7,000,000
Series H (1)	$ 175.0
Series H (1)	$ 25.00	$ 25.00

[1] The net proceeds received from this offering were used for general corporate purposes, including the reduction of borrowings outstanding under the Company's revolving credit facility and the redemption of shares of the Company's preferred stock.