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Note 6 - Earnings Per Share ("EPS") (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands						2 Months Ended	6 Months Ended	12 Months Ended
	Jul. 19, 2018	May 24, 2018	Aug. 31, 2016	Feb. 29, 2016	Feb. 26, 2016	Jul. 19, 2018	Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 16, 2018	Aug. 26, 2016
Payments for Repurchase of Common Stock								$ 30,000		$ 25,000
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member]
Payments for Repurchase of Common Stock		$ 30,000			$ 25,000
Stock Repurchased and Retired During Period, Shares	400	400	100		400	800	500
Stock Repurchase Program, Remaining Authorized Repurchase Amount											$ 12,000	$ 7,500
Accelerated Share Repurchases, Final Price Paid Per Share						$ 37.18	$ 47.08
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member] \| Common Stock [Member]
Stock Repurchase Program, Authorized Amount		$ 30,000			$ 25,000
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 41.41		$ 46.40
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount								42	100	100
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount								700	500	400