Note 7 - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Net operating loss carryforwards	$ 28,638
Items currently not deductible for tax purposes	3,071
Foreign and other tax credit carryforwards	4,822
	36,531
Less valuation allowance	(29,051)
Net deferred tax assets	7,480
Depreciation	(6,343)
Other	(4,129)
Total deferred tax liabilities	(10,472)
Net deferred tax liability	$ (2,992)
Predecessor [Member]
Net operating loss carryforwards		$ 60,772
Items currently not deductible for tax purposes		21,445
Foreign and other tax credit carryforwards		34,131
		116,348
Less valuation allowance		(33,037)
Net deferred tax assets		83,311
Depreciation		(91,105)
Other		(48,922)
Total deferred tax liabilities		(140,027)
Net deferred tax liability		$ (56,716)