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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (4,782,000) $ 5,459,000 $ 7,411,000
Other comprehensive income:      
Unrealized Gain on Foreign Currency Derivatives, before Tax (452,000) 5,000 (303,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 87,000 (2,000) 103,000
Interest rate hedging derivatives:      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 65,000 0 (5,000)
Income tax benefit (expense) (15,000) 0 2,000
Post retirement benefit plan adjustments:      
Net actuarial (loss) gain 1,081,000 (268,000) 474,000
Prior service costs (496,000) (496,000) (496,000)
Income tax benefit (expense) (123,000) 255,000 (12,000)
Comprehensive income (loss) $ (4,735,000) $ 4,953,000 $ 7,180,000