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Note 14 - Weighted-average Asset Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fixed Income Funds [Member]    
Defined Benefit Plan, Target Plan Asset Allocations 20.00%  
Fair values of the Pension Plan's assets $ 8,571 $ 7,400
Asset Category, Percentage 19.00% 16.00%
Domestic Equity [Member]    
Defined Benefit Plan, Target Plan Asset Allocations 49.00%  
Fair values of the Pension Plan's assets $ 20,479 $ 24,373
Asset Category, Percentage 47.00% 54.00%
International Equity [Member]    
Defined Benefit Plan, Target Plan Asset Allocations 21.00%  
Fair values of the Pension Plan's assets $ 9,687 $ 8,869
Asset Category, Percentage 22.00% 19.00%
Real Estate [Member]    
Defined Benefit Plan, Target Plan Asset Allocations 10.00%  
Fair values of the Pension Plan's assets $ 5,248 $ 4,810
Asset Category, Percentage 12.00% 11.00%
Defined Benefit Plan, Target Plan Asset Allocations 100.00%  
Fair values of the Pension Plan's assets $ 43,985 $ 45,452
Asset Category, Percentage 100.00% 100.00%