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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net income $ 1,029,000 $ 2,484,000 $ 5,379,000 $ 9,719,000
Other comprehensive income:        
Unrealized Gain on Foreign Currency Derivatives, before Tax 67,000 0 67,000 0
Unrealized Foreign Currency Hedge Gain (Loss), Tax (23,000) 0 (23,000) 0
Interest rate swaps:        
Adjustment for amortization of losses included in net income 0 6,000 5,000 16,000
Income tax expense 0 2,000 2,000 5,000
Post retirement benefit plan adjustments:        
Net actuarial loss 38,000 42,000 116,000 126,000
Prior service costs (124,000) (124,000) (372,000) (372,000)
Income tax benefit 26,000 24,000 77,000 73,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 1,013,000 $ 2,430,000 $ 5,247,000 $ 9,557,000