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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Shared-based Compensation, Tax Benefit from Compensation Expense, Restricted Stock $ (126,000)    
Current:      
Federal - US 1,993,000 $ 3,408,000 $ 4,466,000
Federal - Foreign 613,000 0 405,000
State and local 24,000 2,000 18,000
Current income tax expense (benefit) 2,630,000 3,410,000 4,889,000
Deferred:      
Federal (407,000) 490,000 1,143,000
Deferred Foreign Income Tax Expense (Benefit) 52,000 (86,000) 27,000
State and local 11,000 22,000 59,000
Deferred income tax expense (benefit) (344,000) 426,000 1,229,000
Total income taxes 2,286,000 3,836,000 6,118,000
Reconciliation of income tax provision:      
Provision at federal statutory rate - US 2,634,000 3,823,000 6,177,000
Effect of foreign taxes (58,000) 34,000 (84,000)
State and local tax expense 35,000 24,000 76,000
Other (14,000) (45,000) (51,000)
Components of deferred tax assets (liabilities):      
Accrued liabilities 608,000 938,000  
Accounts receivable 156,000 110,000  
Inventory 371,000 588,000  
Other, net (292,000) (255,000)  
Total current asset 843,000 1,381,000  
Property, plant, and equipment (3,345,000) (5,274,000)  
Post retirement benefits 2,060,000 3,212,000  
Other, net 47,000 (311,000)  
Deferred Tax Liabilities, Net, Noncurrent (1,238,000) (2,373,000)  
Operating Loss Carryforwards   0  
Operating Loss Carryforwards, Valuation Allowance   0  
Unrecognized Tax Benefits 0 0  
Deferred Tax Liabilities, Net 395,000 992,000  
Deferred Tax Charge (Benefit) Adjustment 484,000 0 0
Transitional Tax, net 299,000    
Deferred Tax Charge (Benefit) Adjustment, net $ 185,000    
Equity [Member]      
Employee Service Shared-based Compensation, Tax Benefit from Compensation Expense, Restricted Stock   $ 16,000 $ (211,000)