Note 21 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Required Dividend Payout		90.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 1,100
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 1,600		$ 55,600
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		$ 3,500
Open Tax Year		2010 2011 2012 2013 2014 2015 2016 2017
State and Local Jurisdiction [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 300		7,900
Canada Revenue Agency [Member]
Current Foreign Tax Expense (Benefit)				$ 24,900
Mexican Tax Authority [Member] | Tax Year 2010 [Member]
Income Tax Examination, Year under Examination	2010
Tax Assessment Estimated Tax Expense	$ 33,700
Tax Assessment Estimated Interest Expense	16,500
Tax Assessment Estimated Penalties Expense	11,400
Taxes Payable, Total	$ 0