Note 14 - Stock Repurchase (Details Textual) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Feb. 29, 2016
Stock Repurchase Program, Authorized Amount					$ 50
Stock Repurchased and Retired During Period, Shares	0	0	0	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 50		$ 50