Note 2 - Chapter 11 Proceeding and Emergence (Details Textual) $ / shares in Units, $ in Millions				12 Months Ended
	Jan. 06, 2017 USD ($) $ / shares	Jul. 20, 2016 USD ($)	Jul. 08, 2016	Dec. 31, 2016 USD ($)	Feb. 24, 2017 USD ($)	Jul. 29, 2016 USD ($)
Secured Claims and Credit Agreement Interests, Percentage			90.00%
Plan of Reorganization, Value of Equity Securities Issued or to Be Issued		$ 200.0
Plan of Reorganization, Equity Securities Issued or to Be Issued, Commitment Premium Percentage		5.00%
Rights Offering Shares, Discount, Percent		20.00%
Restructuring Plan, Value, Maximum		$ 750.0
Plan of Reorganization, Recovery Pool		$ 33.0
Plan of Reorganization, Percentage of New Common Equity Reserved for Management Incentive Program		10.00%
Restructuring Costs, Filed Claims Not Yet Assessed				$ 960.0
Bankruptcy Proceedings, Date Petition for Bankruptcy Filed		Jul. 20, 2016
Treated As An Allowed Claim [Member]
Restructuring Cost, Unrecorded Accrued Interest				$ 60.5
Subsequent Event [Member]
Plan of Reorganization, Value of Equity Securities Issued or to Be Issued	$ 200.0
Subsequent Event [Member] | New Warrants [Member]
Plan of Reorganization, Warrants Issued or to Be Issued, Term	7 years
Plan of Reorganization, Warrants Issued or to Be Issued, Percentage of New Common Equity into which the Warrants are Convertible	6.00%
Plan of Reorganization, Warrants Issued or to Be Issued, Strike Price per Share | $ / shares	$ 27.95
Subsequent Event [Member] | New Warrants [Member] | Existing Holders of C & J Common Equity [Member]
Plan of Reorganization, Warrants Issued or to Be Issued, Percentage of New Common Equity into which the Warrants are Convertible	2.00%
Subsequent Event [Member] | New Warrants [Member] | Unsecured Creditors [Member]
Plan of Reorganization, Warrants Issued or to Be Issued, Percentage of New Common Equity into which the Warrants are Convertible	4.00%
DIP Lenders [Member] | Superpriority Secured Delayed Draw Term Loan Facility [Member]
Debtor-in-Possession Financing, Amount Arranged						$ 100.0
PNC Bank, National Association [Member] | New Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100.0
Line of Credit Facility, Availability Block	$ 20.0				$ 20.0
Line of Credit Facility, Availability Block, Conditions of Expiration, Fixed Charge Coverage Ratio	1.1