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Note 5 - Earnings Per Share ("EPS") (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions				6 Months Ended	12 Months Ended
	Aug. 31, 2016	Feb. 29, 2016	Feb. 26, 2016	Aug. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 26, 2016
Payments for Repurchase of Common Stock						$ 25,000
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member]
Payments for Repurchase of Common Stock			$ 25,000
Stock Repurchased and Retired During Period, Shares	0.1	0.4		0.5
Accelerated Stock Repurchase [Member] \| Morgan Stanley & Co., LLC [Member] \| Common Stock [Member]
Stock Repurchase Program, Authorized Amount			$ 25,000
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 46.40
Accelerated Share Repurchases, Settlement (Payment) or Receipt								$ 7,500
Accelerated Share Repurchases, Final Price Paid Per Share				$ 47.08
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					0.5	0.4	0.2
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					0.1	0.1	0.1