Note 6 - Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balance at beginning of year	$ 6,525
Additions based on tax positions related to the current year
Reductions for tax positions of prior years	(6,525)
Balance at end of year	0	$ 6,525
Predecessor [Member]
Balance at beginning of year	$ 6,525
Additions based on tax positions related to the current year		6,525
Reductions for tax positions of prior years
Balance at end of year		$ 6,525