Note 12 - Preferred Stock, Common Stock and Convertible Unit Transactions - Preferred Stock Redeemed (Details) - Series I Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions			9 Months Ended
		Sep. 06, 2017	Sep. 30, 2017
Depositary Shares Redeemed (in shares)		9,000	9,000,000	[1]
Redemption Amount	[1]		$ 225
Offering/ Redemption Price (in dollars per share)	[1]		$ 25

[1] On September 6, 2017, the Company partially redeemed 9,000 shares of its issued and outstanding Series I Preferred Stock, representing 56.25% of the issued and outstanding Series I Preferred Stock. In connection with this partial redemption the Company recorded a charge of $7.0 million resulting from the difference between the redemption amount and the carrying amount of the Series I Preferred Stock on the Company’s Condensed Consolidated Balance Sheets in accordance with the FASB’s guidance on Distinguishing Liabilities from Equity. The $7.0 million was subtracted from net income to arrive at net income available to common shareholders and is used in the calculation of earnings per share for the nine months ended September 30, 2017.