Note 6 - Income Taxes - Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal statutory rate	35.00%
State taxes, net of federal benefit	8.00%
Domestic production activities deduction
Effect of foreign losses	9.80%
Impairment
Changes in uncertain tax positions	37.70%
Effects of the plan of reorganization	1114.90%
Valuation allowance	(959.30%)
Other	16.30%
Effective income tax rate	229.80%
Predecessor [Member]
Federal statutory rate		35.00%	35.00%
State taxes, net of federal benefit		0.30%	1.40%
Domestic production activities deduction			(0.20%)
Effect of foreign losses		(2.00%)	(0.30%)
Impairment		(8.80%)	(9.80%)
Changes in uncertain tax positions		(0.60%)
Effects of the plan of reorganization		(1.30%)
Valuation allowance		(10.90%)
Other		0.30%	(0.60%)
Effective income tax rate		12.00%	25.50%