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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income $ 855,000 $ 1,029,000 $ 4,704,000 $ 5,379,000
Other comprehensive income:        
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (139,000) 67,000 657,000 67,000
Unrealized Foreign Currency Hedge Gain (Loss), Tax 48,000 (23,000) (223,000) (23,000)
Interest rate swaps:        
Adjustment for amortization of losses included in net income 0 0 5,000
Income tax expense 0 0 2,000
Post retirement benefit plan adjustments:        
Net actuarial loss 37,000 38,000 112,000 116,000
Prior service costs (124,000) (124,000) (372,000) (372,000)
Income tax benefit 26,000 26,000 78,000 77,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 703,000 $ 1,013,000 $ 4,956,000 $ 5,247,000