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Note 10 - Postemployment Benefit Plans, Pre-spin (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Multiemployer Plans, Postretirement Benefit [Member]    
Pension Expense $ 0 $ 1,100,000
Multiemployer Plans, Savings [Member]    
Defined Contribution Plan, Cost Recognized $ 0 $ 100,000