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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 5,459,000 $ 7,411,000 $ 12,050,000
Other comprehensive income:      
Unrealized Gain on Foreign Currency Derivatives, before Tax 5,000 303,000 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (2,000) 103,000 0
Interest rate swaps:      
Adjustment for amortization of losses included in net income 0 5,000 21,000
Income tax expense 0 2,000 8,000
Post retirement benefit plan adjustments:      
Net actuarial (loss) gain (268,000) 474,000 217,000
Prior service costs (496,000) (496,000) (496,000)
Income tax benefit (expense) 255,000 (12,000) 81,000
Comprehensive income $ 4,953,000 $ 7,180,000 $ 11,865,000