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Note 7 - Earnings Per Share ("EPS") (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			2 Months Ended	3 Months Ended		9 Months Ended
	Jul. 19, 2018	May 24, 2018	Jul. 19, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jul. 16, 2018
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	0.4	0.8
Stock Repurchase Program, Remaining Authorized Repurchase Amount								$ 12,000
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				0.9	0.5	0.6	0.6