Note 4 - Fresh Start Accounting (Details Textual) - USD ($) $ in Millions	Jan. 06, 2017	Jul. 20, 2016
Plan of Reorganization, Value of Equity Securities Issued or to Be Issued		$ 200.0
Subsequent Event [Member]
Conditions to Adopt Fresh Start Accounting, Percentage of Voting Shares of Successor Received By Holders of Predecessor Shares, Threshold	50.00%
Plan of Reorganization, Value of Equity Securities Issued or to Be Issued	$ 200.0
Subsequent Event [Member] | Successor [Member]
Reorganization Value	750.0
Subsequent Event [Member] | Successor [Member] | New Equity and New Warrants [Member]
Reorganization Value	725.9
Subsequent Event [Member] | Successor [Member] | Other Liabilities Not Eliminated or Discharged Under the Restructuring Plan [Member]
Reorganization Value	24.1
Subsequent Event [Member] | Successor [Member] | Minimum [Member]
Reorganization Value	600.0
Subsequent Event [Member] | Successor [Member] | Maximum [Member]
Reorganization Value	$ 900.0