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Changes in Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 0	$ 31,062,000	$ 0	$ 31,062,000	$ 26,780,000	$ 28,285,000
Sales Revenue, Goods, Net	65,225,000	36,794,000	124,937,000	73,130,000
Contracts Revenue	3,376,000	10,574,000	6,710,000	10,984,000
Total net sales	68,601,000	47,368,000	131,647,000	84,114,000
Cost of Goods Sold	60,704,000	40,027,000	115,864,000	70,296,000
Gross margin	7,897,000	7,341,000	15,783,000	13,818,000
Selling, General and Administrative Expense	6,479,000	4,168,000	13,239,000	8,093,000
Operating Income (Loss)	1,418,000	3,173,000	2,544,000	5,725,000
Interest Expense	624,000	65,000	1,073,000	129,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(12,000)	(12,000)	(24,000)	(24,000)
Other Nonoperating Income (Expense)	612,000	53,000	1,049,000	105,000
Income before income taxes	806,000	3,120,000	1,495,000	5,620,000
Income Tax Expense (Benefit)	361,000	958,000	532,000	1,772,000
Net income	$ 445,000	$ 2,162,000	$ 963,000	$ 3,848,000
Earnings Per Share, Basic	$ 0.06	$ 0.28	$ 0.12	$ 0.50
Earnings Per Share, Diluted	$ 0.06	$ 0.28	$ 0.12	$ 0.50
Accounts Receivable, Net, Current	$ 38,601,000		$ 38,601,000		19,846,000
Inventory, Net	19,683,000		19,683,000		13,459,000
Prepaid Expense and Other Assets, Current	8,382,000		8,382,000		4,870,000
Assets, Current	66,666,000		66,666,000		64,955,000
Property, Plant and Equipment, Net	81,609,000		81,609,000		68,631,000
Goodwill	22,957,000		22,957,000		2,403,000
Intangible Assets, Net (Excluding Goodwill)	17,148,000		17,148,000		513,000
Other Assets, Noncurrent	2,125,000		2,125,000		2,076,000
Assets	190,505,000		190,505,000		138,578,000
Liabilities, Current [Abstract]
Revolving line of credit	784,000		784,000		0
Long-term Debt, Current Maturities	3,230,000		3,230,000		3,000,000
Accounts payable	24,883,000		24,883,000		13,850,000
Employee-related Liabilities, Current	5,075,000		5,075,000		3,524,000
Other Liabilities, Current	5,210,000		5,210,000		4,212,000
Liabilities, Current	39,182,000		39,182,000		24,586,000
Long-term debt	39,401,000		39,401,000		3,750,000
Deferred Tax Liabilities, Net	395,000		395,000		395,000
Postemployment Benefits Liability, Noncurrent	7,912,000		7,912,000		7,954,000
Liabilities	86,890,000		86,890,000		36,685,000
Commitments and Contingencies	0		0		0
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Value, Issued	0		0		0
Common Stock, Value, Issued	78,000		78,000		77,000
Additional Paid in Capital, Common Stock	32,434,000		32,434,000		31,465,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,832,000	$ 2,818,000	1,832,000	$ 2,818,000	2,070,000	$ 2,414,000
Treasury Stock, Value	(28,403,000)		(28,403,000)		(28,153,000)
Retained Earnings (Accumulated Deficit)	97,674,000		97,674,000		96,434,000
Stockholders' Equity Attributable to Parent	103,615,000		103,615,000		101,893,000
Liabilities and Equity	190,505,000		190,505,000		138,578,000
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization			4,701,000	3,209,000
Share-based Compensation			969,000	790,000
Foreign Currency Transaction Gain (Loss), Unrealized			(5,000)	(1,000)
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable			(12,463,000)	(3,163,000)
Increase (Decrease) in Inventories			700,000	(1,163,000)
Increase (Decrease) in Prepaid Expense and Other Assets			(1,644,000)	(304,000)
Increase (Decrease) in Accounts Payable			8,878,000	2,756,000
Accrued and other liabilities			1,664,000	290,000
Post retirement benefits liability			(205,000)	(232,000)
Net Cash Provided by (Used in) Operating Activities			3,558,000	6,030,000
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Property, Plant, and Equipment			(3,428,000)	(1,381,000)
Business Combination, Consideration Transferred			(62,457,000)	0
Net Cash Provided by (Used in) Investing Activities			(65,885,000)	(1,381,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayments of Lines of Credit			(46,514,000)	0
Proceeds from Lines of Credit			47,298,000	0
Proceeds from (Repayments of) Debt			45,000,000
Repayments of Short-term Debt			(8,438,000)	(1,500,000)
Payments of Loan Costs			(757,000)	0
Payments of Dividends			792,000
Payments of Dividends			792,000	0
Payments related to purchase of treasury stock			(250,000)	(372,000)
Net Cash Provided by (Used in) Financing Activities			35,547,000	(1,872,000)
Cash and Cash Equivalents, Period Increase (Decrease)			(26,780,000)	2,777,000
Interest Paid [Abstract]
Interest Paid			1,022,000	129,000
Income Taxes Paid, Net			520,000	2,212,000
Other Noncash Investing and Financing Items [Abstract]
Capital Expenditures Incurred but Not yet Paid			574,000	$ 158,000
Scenario, Previously Reported [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Attributable to Parent					101,893,000
Without adoption of Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and Cash Equivalents, at Carrying Value	0		0		26,780,000
Sales Revenue, Goods, Net	65,225,000		124,937,000
Contracts Revenue	6,396,000		9,072,000
Total net sales	71,621,000		134,009,000
Cost of Goods Sold	63,176,000		117,624,000
Gross margin	8,445,000		16,385,000
Selling, General and Administrative Expense	6,479,000		13,239,000
Operating Income (Loss)	1,966,000		3,146,000
Interest Expense	624,000		1,073,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(12,000)		(24,000)
Other Nonoperating Income (Expense)	612,000		1,049,000
Income before income taxes	1,354,000		2,097,000
Income Tax Expense (Benefit)	476,000		658,000
Net income	$ 878,000		$ 1,439,000
Earnings Per Share, Basic	$ 0.11		$ 0.19
Earnings Per Share, Diluted	$ 0.11		$ 0.18
Accounts Receivable, Net, Current	$ 38,601,000		$ 38,601,000
Inventory, Net	19,683,000		19,683,000
Prepaid Expense and Other Assets, Current	7,789,000		7,789,000
Assets, Current	66,073,000		66,073,000
Property, Plant and Equipment, Net	81,609,000		81,609,000
Goodwill	22,957,000		22,957,000
Intangible Assets, Net (Excluding Goodwill)	17,148,000		17,148,000
Other Assets, Noncurrent	2,125,000		2,125,000
Assets	189,912,000		189,912,000
Liabilities, Current [Abstract]
Revolving line of credit	784,000		784,000
Long-term Debt, Current Maturities	3,230,000		3,230,000
Accounts payable	24,883,000		24,883,000
Employee-related Liabilities, Current	5,075,000		5,075,000
Other Liabilities, Current	5,210,000		5,210,000
Liabilities, Current	39,182,000		39,182,000
Long-term debt	39,401,000		39,401,000
Deferred Tax Liabilities, Net	395,000		395,000
Postemployment Benefits Liability, Noncurrent	7,912,000		7,912,000
Liabilities	86,890,000		86,890,000
Commitments and Contingencies	0		0
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Value, Issued	0		0
Common Stock, Value, Issued	78,000		78,000
Additional Paid in Capital, Common Stock	32,434,000		32,434,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,832,000		1,832,000
Treasury Stock, Value	(28,403,000)		(28,403,000)
Retained Earnings (Accumulated Deficit)	97,081,000		97,081,000
Stockholders' Equity Attributable to Parent	103,022,000		103,022,000
Liabilities and Equity	189,912,000		189,912,000
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization			4,701,000
Share-based Compensation			969,000
Foreign Currency Transaction Gain (Loss), Unrealized			(5,000)
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable			(12,463,000)
Increase (Decrease) in Inventories			700,000
Increase (Decrease) in Prepaid Expense and Other Assets			(2,120,000)
Increase (Decrease) in Accounts Payable			8,878,000
Accrued and other liabilities			1,664,000
Post retirement benefits liability			(205,000)
Net Cash Provided by (Used in) Operating Activities			3,558,000
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Property, Plant, and Equipment			(3,428,000)
Business Combination, Consideration Transferred			(62,457,000)
Net Cash Provided by (Used in) Investing Activities			(65,885,000)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayments of Lines of Credit			(46,514,000)
Proceeds from Lines of Credit			47,298,000
Proceeds from (Repayments of) Debt			45,000,000
Repayments of Short-term Debt			(8,438,000)
Payments of Loan Costs			(757,000)
Payments of Dividends			792,000
Payments related to purchase of treasury stock			(250,000)
Net Cash Provided by (Used in) Financing Activities			35,547,000
Cash and Cash Equivalents, Period Increase (Decrease)			(26,780,000)
Interest Paid [Abstract]
Interest Paid			1,022,000
Income Taxes Paid, Net			520,000
Other Noncash Investing and Financing Items [Abstract]
Capital Expenditures Incurred but Not yet Paid			574,000
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and Cash Equivalents, at Carrying Value	0		0		0
Sales Revenue, Goods, Net			0
Contracts Revenue	3,020,000		2,362,000
Total net sales	3,020,000		2,362,000
Cost of Goods Sold	2,472,000		1,760,000
Gross margin	548,000		602,000
Selling, General and Administrative Expense			0
Operating Income (Loss)	548,000		602,000
Interest Expense			0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			0
Other Nonoperating Income (Expense)	0		0
Income before income taxes	548,000		602,000
Income Tax Expense (Benefit)	115,000		126,000
Net income	$ 433,000		$ 476,000
Earnings Per Share, Basic	$ 0.00		$ 0.00
Earnings Per Share, Diluted	$ 0.00		$ 0.00
Accounts Receivable, Net, Current	$ 0		$ 0
Inventory, Net	0		0
Prepaid Expense and Other Assets, Current	(593,000)		(593,000)
Assets, Current	(593,000)		(593,000)
Property, Plant and Equipment, Net	0		0
Goodwill	0		0
Intangible Assets, Net (Excluding Goodwill)	0		0
Other Assets, Noncurrent	0		0
Assets	(593,000)		(593,000)
Liabilities, Current [Abstract]
Revolving line of credit	0		0
Long-term Debt, Current Maturities	0		0
Accounts payable	0		0
Employee-related Liabilities, Current	0		0
Other Liabilities, Current	0		0
Liabilities, Current	0		0
Long-term debt	0		0
Deferred Tax Liabilities, Net	0		0
Postemployment Benefits Liability, Noncurrent	0		0
Liabilities	0		0
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock, Value, Issued	0		0
Common Stock, Value, Issued	0		0
Additional Paid in Capital, Common Stock	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Treasury Stock, Value	0		0
Retained Earnings (Accumulated Deficit)	(593,000)		(593,000)
Stockholders' Equity Attributable to Parent	(593,000)		(593,000)		102,962,000
Liabilities and Equity	(593,000)		(593,000)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization			0
Share-based Compensation			0
Foreign Currency Transaction Gain (Loss), Unrealized			0
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accounts Receivable			0
Increase (Decrease) in Inventories			0
Increase (Decrease) in Prepaid Expense and Other Assets			(476,000)
Increase (Decrease) in Accounts Payable			0
Accrued and other liabilities			0
Post retirement benefits liability			0
Net Cash Provided by (Used in) Operating Activities			0
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Property, Plant, and Equipment			0
Business Combination, Consideration Transferred			0
Net Cash Provided by (Used in) Investing Activities			0
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayments of Lines of Credit			0
Proceeds from Lines of Credit			0
Proceeds from (Repayments of) Debt			0
Repayments of Short-term Debt			0
Payments of Loan Costs			0
Payments related to purchase of treasury stock			0
Net Cash Provided by (Used in) Financing Activities			0
Cash and Cash Equivalents, Period Increase (Decrease)			0
Interest Paid [Abstract]
Interest Paid			0
Income Taxes Paid, Net			0
Other Noncash Investing and Financing Items [Abstract]
Capital Expenditures Incurred but Not yet Paid			0
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Attributable to Parent	$ 97,674,000		97,674,000
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments of Dividends			792,000
Retained Earnings [Member] | Scenario, Previously Reported [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Attributable to Parent					96,434,000
Retained Earnings [Member] | Without adoption of Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income			$ 1,439,000
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Attributable to Parent					$ 97,503,000

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