Note 2 - Common Stock Outstanding and Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Feb. 21, 2020	Sep. 18, 2019
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)				1.5	1.0
Stock Repurchased During Period, Shares (in shares)		1.5
Payments for Repurchase of Common Stock	$ 12,653	$ 13,600	$ (0)
Payments for Repurchase of Common Stock, Average Price Per Share (in dollars per share)		$ 9.11