Note 14 - Capital Stock (Details) - Third Quarter 2017 Repurchase Program [Member] - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Aug. 09, 2017
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount			$ 50.0
Treasury Stock Acquired, Average Cost Per Share		$ 18.84
Stock Repurchased During Period, Shares		531,013
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 40.0
Subsequent Event [Member]
Class of Stock [Line Items]
Treasury Stock Acquired, Average Cost Per Share	$ 16.24
Stock Repurchased During Period, Shares	924,720
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 25.0