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Savings and Retirement Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Cumulative gains losses as percentage of benefit obligations or plan assets 10.00%      
Deposit Administration Contract [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period $ 616,000      
Plan assets, end of period 800,000 $ 616,000    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 616,000 616,000 $ 800,000 $ 616,000
Allocation of pension plan assets [Abstract]        
Target Allocation     100.00% 100.00%
Actual Allocation     100.00% 100.00%
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 616,000 616,000 $ 800,000 $ 616,000
Deposit Administration Contract [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 0      
Plan assets, end of period 0 0    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 0 0 0 0
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 0 0 0 0
Deposit Administration Contract [Member] | Significant Observable Inputs (Level 2) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 616,000      
Plan assets, end of period 800,000 616,000    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 616,000 616,000 800,000 616,000
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 616,000 616,000 800,000 616,000
Deposit Administration Contract [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 0      
Plan assets, end of period 0 0    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 0 0 0 0
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 0 0 0 0
Other Contracts [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 3,321,000      
Plan assets, end of period 3,946,000 3,321,000    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 3,946,000 3,321,000 $ 3,946,000 $ 3,321,000
Allocation of pension plan assets [Abstract]        
Target Allocation     100.00% 100.00%
Actual Allocation     100.00% 100.00%
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 3,946,000 3,321,000 $ 3,946,000 $ 3,321,000
Reconciliation of beginning and ending balances for Level 3 assets [Roll Forward]        
Beginning balance 3,326,000 3,005,000    
Loss recognized in earnings 59,000 54,000    
Actuarial loss (26,000) 291,000    
Purchases 141,000 130,000    
Sales (21,000) (21,000)    
Transfers (5,000) (3,000)    
Foreign currency translation 472,000 (130,000)    
Ending balance 3,946,000 3,326,000    
Other Contracts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period (5,000)      
Plan assets, end of period 0 (5,000)    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets (5,000) (5,000) 0 (5,000)
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets (5,000) (5,000) 0 (5,000)
Other Contracts [Member] | Significant Observable Inputs (Level 2) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 0      
Plan assets, end of period 0 0    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 0 0 0 0
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 0 0 0 0
Other Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 3,326,000      
Plan assets, end of period 3,946,000 3,326,000    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Fair value of plan assets 3,326,000 3,326,000 3,946,000 3,326,000
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets 3,326,000 3,326,000 3,946,000 3,326,000
The U.S. Defined Contribution Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer discretionary contribution amount to U.S. plan 585,000 438,000    
The Netherlands and U.K. Defined Contribution Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total contribution expense associated with the plan 55,000 38,000    
The Netherlands Defined Benefit Pension Plan [Member]        
Benefit payments in subsequent fiscal years [Abstract]        
2018     23,000  
2019     24,000  
2020     24,000  
2021     31,000  
2022     39,000  
2023 to 2027     262,000  
Total benefit payments     403,000  
Contributions by employer in next fiscal year     140,000  
Changes in benefit obligations [Roll Forward]        
Projected benefit obligation, beginning of period 3,510,000 3,665,000    
Service cost 95,000 104,000    
Interest cost 75,000 76,000    
Benefits paid (21,000) (21,000)    
Plan amendment 0 (658,000)    
Actuarial loss (gain) (8,000) 474,000    
Foreign currency translation 498,000 (130,000)    
Projected benefit obligation, end of period 4,149,000 3,510,000    
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 3,321,000 3,002,000    
Contributions to plan 141,000 125,000    
Management cost (14,000) (12,000)    
Actual return on assets 47,000 357,000    
Benefits paid (21,000) (21,000)    
Foreign currency translation 472,000 (130,000)    
Plan assets, end of period 3,946,000 3,321,000    
Amount recognized in other comprehensive loss [Abstract]        
Unrecognized net prior service benefit (892,000) (870,000)    
Unrecognized net losses 865,000 779,000    
Additional other comprehensive (gain) /loss (gross of income taxes) (27,000) (91,000)    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Projected benefit obligation 3,510,000 3,510,000 4,149,000 3,510,000
Accumulated benefit obligation     4,005,000 3,376,000
Fair value of plan assets 3,321,000 3,321,000 3,946,000 3,321,000
Excess of the projected benefit obligation over the fair value of the plan assets     203,000 189,000
Components of benefit costs for defined benefit retirement plans [Abstract]        
Gross service cost, net of employee contribution 84,000 99,000    
Interest cost 75,000 76,000    
Management cost 13,000 5,000    
Expected return on assets (74,000) (66,000)    
Amortization (54,000) (30,000)    
Net periodic retirement cost $ 44,000 $ 84,000    
Major assumptions used in the calculations [Abstract]        
Discount rate 2.00% 2.00%    
Expected return on assets 2.00% 2.00%    
Expected rate of increase in future compensation [Abstract]        
Expected rate of increase in future compensation, General 2.50% 2.50%    
Expected rate of increase in future compensation, Individual 0.00% 0.00%    
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets $ 3,321,000 $ 3,321,000 3,946,000 3,321,000
The U.K. Defined Benefit Pension Plan [Member]        
Benefit payments in subsequent fiscal years [Abstract]        
2018     194,000  
2019     0  
2020     0  
2021     0  
2022     0  
2023 to 2027     714,000  
Total benefit payments     908,000  
Contributions by employer in next fiscal year     61,000  
Changes in benefit obligations [Roll Forward]        
Projected benefit obligation, beginning of period 736,000 744,000    
Service cost 4,000 4,000    
Interest cost 20,000 26,000    
Benefits paid 0 (96,000)    
Other (4,000) (4,000)    
Actuarial loss (gain) 34,000 197,000    
Foreign currency translation 72,000 (135,000)    
Projected benefit obligation, end of period 862,000 736,000    
Changes in plan assets [Roll Forward]        
Plan assets, beginning of period 616,000 775,000    
Contributions to plan 57,000 53,000    
Management cost (4,000) (4,000)    
Actual return on assets 68,000 15,000    
Benefits paid 0 (96,000)    
Foreign currency translation 63,000 (127,000)    
Plan assets, end of period 800,000 616,000    
Amount recognized in other comprehensive loss [Abstract]        
Unrecognized net losses 225,000 276,000    
Projected benefit obligation, accumulated benefit obligations and the fair value plan assets [Abstract]        
Projected benefit obligation 736,000 736,000 862,000 736,000
Accumulated benefit obligation     862,000 736,000
Fair value of plan assets 616,000 616,000 800,000 616,000
Excess of the projected benefit obligation over the fair value of the plan assets     62,000 120,000
Components of benefit costs for defined benefit retirement plans [Abstract]        
Gross service cost, net of employee contribution 4,000 5,000    
Interest cost 20,000 26,000    
Expected return on assets (14,000) (21,000)    
Amortization 53,000 7,000    
Net periodic retirement cost $ 63,000 $ 17,000    
Major assumptions used in the calculations [Abstract]        
Discount rate 2.50% 2.70%    
Expected return on assets 2.13% 2.20%    
Fair value of pension plan assets [Abstract]        
Fair value of pension plan assets $ 616,000 $ 616,000 $ 800,000 $ 616,000