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Change in Accounting Policies Changes in Consolidated Balance Sheet (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash and cash equivalents $ 1,891,000 $ 26,780,000 $ 28,285,000 $ 8,943,000
Accounts Receivable, Net, Current 45,468,000 19,846,000    
Inventory, Finished Goods, Gross 6,453,000 2,948,000    
Inventory, Work in Process, Gross 2,034,000 2,061,000    
Inventory, Raw Materials, Gross 17,278,000 8,450,000    
Inventory, Net 25,765,000 13,459,000    
Contract with Customer, Asset, Net 3,915,000 2,872,000    
Value Added Tax Receivable 1,789,000 610,000    
Prepaid Expense and Other Assets, Current 1,474,000 1,388,000    
Assets, Current 80,302,000 64,955,000    
Property, plant and equipment — net 80,657,000 68,631,000    
Deferred Tax Assets, Net, Noncurrent 1,153,000 0    
Deferred Tax Assets, Net 1,153,000      
Goodwill 21,476,000 2,403,000    
Intangible Assets, Net (Excluding Goodwill) 15,413,000 513,000    
Other Assets, Noncurrent 2,197,000 2,076,000    
Assets 201,198,000 138,578,000    
Long-term Debt, Current Maturities 3,230,000 3,000,000    
Long-term Line of Credit 17,375,000 0    
Accounts payable 25,450,000 13,850,000    
Contract with Customer, Liability 1,686,000 955,000    
Postemployment Benefits Liability, Current 1,157,000 1,096,000    
Employee-related Liabilities, Current 5,154,000 3,524,000    
Taxes Payable, Current 0      
Other Liabilities, Current 3,514,000 2,161,000    
Liabilities, Current 40,191,000 24,586,000    
Long-term Debt 37,784,000 3,750,000    
Deferred Tax Liabilities, Net   395,000    
Postemployment Benefits Liability, Noncurrent 6,919,000 7,954,000    
Liabilities 102,269,000 36,685,000    
Commitments and Contingencies 0 0    
Preferred Stock, Value, Issued 0 0    
Common Stock, Value, Issued 78,000 77,000    
Additional Paid in Capital, Common Stock 33,208,000 31,465,000    
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,117,000 2,070,000    
Treasury Stock, Value 28,403,000 28,153,000    
Retained Earnings (Accumulated Deficit) 91,929,000 96,434,000    
Stockholders' Equity Attributable to Parent 98,929,000 101,893,000 $ 96,766,000 $ 88,733,000
Liabilities and Equity 201,198,000 138,578,000    
Without adoption of Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash and cash equivalents 1,891,000 26,780,000    
Accounts Receivable, Net, Current 45,468,000      
Inventory, Finished Goods, Gross 6,453,000      
Inventory, Work in Process, Gross 2,034,000      
Inventory, Raw Materials, Gross 17,278,000      
Inventory, Net 25,765,000      
Contract with Customer, Asset, Net 3,559,000      
Value Added Tax Receivable 1,789,000      
Prepaid Expense and Other Assets, Current 1,474,000      
Assets, Current 79,946,000      
Property, plant and equipment — net 80,657,000      
Deferred Tax Assets, Net 1,153,000      
Goodwill 21,476,000      
Intangible Assets, Net (Excluding Goodwill) 15,413,000      
Other Assets, Noncurrent 2,197,000      
Assets 200,842,000      
Long-term Debt, Current Maturities 3,230,000      
Long-term Line of Credit 17,375,000      
Accounts payable 25,450,000      
Contract with Customer, Liability 1,686,000      
Postemployment Benefits Liability, Current 1,157,000      
Employee-related Liabilities, Current 5,154,000      
Taxes Payable, Current 0      
Other Liabilities, Current 3,514,000      
Liabilities, Current 40,191,000      
Long-term Debt 37,784,000      
Postemployment Benefits Liability, Noncurrent 6,919,000      
Liabilities 102,269,000      
Commitments and Contingencies 0      
Preferred Stock, Value, Issued 0      
Common Stock, Value, Issued 78,000      
Additional Paid in Capital, Common Stock 33,208,000      
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,117,000      
Treasury Stock, Value 28,403,000      
Retained Earnings (Accumulated Deficit) 91,573,000      
Stockholders' Equity Attributable to Parent 98,573,000      
Liabilities and Equity 200,842,000      
Accounting Standards Update 2014-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cash and cash equivalents 0 0    
Accounts Receivable, Net, Current 0      
Inventory, Finished Goods, Gross 0      
Inventory, Work in Process, Gross 0      
Inventory, Raw Materials, Gross 0      
Inventory, Net 0      
Contract with Customer, Asset, Net (356,000)      
Value Added Tax Receivable 0      
Prepaid Expense and Other Assets, Current 0      
Assets, Current (356,000)      
Property, plant and equipment — net 0      
Deferred Tax Assets, Net 0      
Goodwill 0      
Intangible Assets, Net (Excluding Goodwill) 0      
Other Assets, Noncurrent 0      
Assets (356,000)      
Long-term Debt, Current Maturities 0      
Long-term Line of Credit 0      
Accounts payable 0      
Contract with Customer, Liability 0      
Postemployment Benefits Liability, Current 0      
Employee-related Liabilities, Current 0      
Taxes Payable, Current 0      
Other Liabilities, Current 0      
Liabilities, Current 0      
Long-term Debt 0      
Postemployment Benefits Liability, Noncurrent 0      
Liabilities 0      
Commitments and Contingencies 0      
Preferred Stock, Value, Issued 0      
Common Stock, Value, Issued 0      
Additional Paid in Capital, Common Stock 0      
Accumulated Other Comprehensive Income (Loss), Net of Tax 0      
Treasury Stock, Value 0      
Retained Earnings (Accumulated Deficit) (356,000)      
Stockholders' Equity Attributable to Parent (356,000) $ 102,962,000    
Liabilities and Equity $ (356,000)