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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets, Valuation Allowance $ 1,532 $ 1,683  
Increase (Decrease) in Pension Plan Obligations (600) (5,800) $ 17,100
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 361 3,528 10,403
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax 200 2,300 6,700
Income Taxes Paid, Net 14,600 1,800 $ 400
Accrued Income Taxes 14,600 800  
Capital Loss Carryforward [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (200) (400)  
Domestic Tax Authority [Member]      
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 61,500    
State and Local Jurisdiction [Member]      
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 122,400    
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]      
Deferred Tax Assets, Valuation Allowance $ 1,500 $ 1,700