Note 3 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Deferred Tax Liabilities, Net		$ 76.6
Deferred Tax Assets, Valuation Allowance		83.0	$ 100.0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Deferred Tax Assets, Net		44.6
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (15.0)
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Deferred Tax Liabilities, Net		$ 121.2