Note 12 - Subsequent Events (Details Textual) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended
	May 08, 2017 USD ($) $ / shares	May 04, 2017 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares
Dividends, Common Stock | $			$ 8,448	$ 15,472
Common Stock, Dividends, Per Share, Declared			$ 0.17	$ 0.31
Subsequent Event [Member]
Dividends, Common Stock | $	$ 4,000
Common Stock, Dividends, Per Share, Declared	$ 0.08
Number of Directors after Acquisition Transaction		9
Number of Independent Directors on Board		1
Subsequent Event [Member] | ORIX Corporation [Member]
Percentage Ownership in Company Purchased by Investor		22.00%
Number of Shares Purchased by Investor | shares		11
Sale Price Per Share Purchased by Investor		$ 57
Voting Rights, Number of Directors Designated		3
Voting Rights, Effective Rate Cap		25.00%