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Note 17 - Weighted-average Assumption Used to Determine Net Post-retirement Benefit Cost (Details) - Other Postretirement Benefit Plans [Member]
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2013
Aug. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Successor [Member]        
Weighted Average Assumption Used To Determine Net Postretirement Benefit Cost [Line Items]        
Discount rate 4.09%   3.49% 4.28%
Salary increase rate 2.50%   2.60% 2.50%
Predecessor [Member]        
Weighted Average Assumption Used To Determine Net Postretirement Benefit Cost [Line Items]        
Discount rate   3.23%    
Salary increase rate   2.50%