Note 7 - Income Taxes - Deferred Tax Valuation Allowance Activity (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Balance		$ (33,037)
Additions (reductions) recorded in the provision for income taxes		(89,399)
Fresh-Start Reporting (a)	[1]	93,385
Balance		(29,051)	$ (33,037)
Predecessor [Member]
Balance		$ (33,037)	(24,112)
Additions (reductions) recorded in the provision for income taxes			(8,925)
Fresh-Start Reporting (a)	[1]
Balance			$ (33,037)

[1] Represents release of the valuation allowance in fresh-start reporting due to the write-off of related deferred tax assets primarily as a result of cancellation of indebtedness (COD) income excluded from gross from gross income for US federal income tax purposes and applied to reduce net operating loss carryforwards.