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Note 7 - Earnings (Loss) Per Share ("EPS") (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			2 Months Ended	3 Months Ended		6 Months Ended
	Jul. 19, 2018	May 24, 2018	Jul. 19, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Payments for Repurchase of Common Stock						$ 30,000
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member]
Payments for Repurchase of Common Stock		$ 30,000
Stock Repurchased and Retired During Period, Shares		0.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 12,000		$ 12,000
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member] \| Subsequent Event [Member]
Stock Repurchased and Retired During Period, Shares	0.4		0.8
Accelerated Share Repurchases, Final Price Paid Per Share			$ 37.18
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member] \| Common Stock [Member]
Stock Repurchase Program, Authorized Amount		$ 30,000
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 41.41
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0.7	0.7	0.6	0.3