Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal - US	$ 3,408,000	$ 4,466,000	$ 1,875,000
Federal - Foreign	0	405,000	453,000
State and local	2,000	18,000	42,000
Current income tax expense (benefit)	3,410,000	4,889,000	2,370,000
Deferred:
Federal	490,000	1,143,000	2,423,000
Deferred Foreign Income Tax Expense (Benefit)	(86,000)	27,000	(29,000)
State and local	22,000	59,000	127,000
Deferred income tax expense (benefit)	426,000	1,229,000	2,521,000
Total income taxes	3,836,000	6,118,000	4,891,000
Reconciliation of income tax provision:
Provision at federal statutory rate - US	3,823,000	6,177,000	4,938,000
Effect of foreign taxes	34,000	(84,000)	(115,000)
Disqualified stock options	0	(5,000)	(84,000)
State and local tax expense, net of federal benefit	24,000	76,000	170,000
Other	(45,000)	(46,000)	(18,000)
Components of deferred tax assets (liabilities):
Accrued liabilities	938,000	820,000
Accounts receivable	110,000	202,000
Inventory	588,000	698,000
Other, net	(255,000)	(122,000)
Total current asset	1,381,000	1,598,000
Property, plant, and equipment	(5,274,000)	(4,844,000)
Post retirement benefits	3,212,000	3,350,000
Other, net	(311,000)	(758,000)
Deferred Tax Liabilities, Net, Noncurrent	(2,373,000)	(2,252,000)
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	16,000	211,000	$ 395,000
Unrecorded deferred tax liabilities, undistributed foreign earnings	6,965,000
Operating Loss Carryforwards	321,000	0
Operating Loss Carryforwards, Valuation Allowance	0	0
Unrecognized Tax Benefits	0	0
Deferred Tax Liabilities, Net	$ 992,000	$ 654,000