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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 3,848,000 $ 4,350,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,209,000 3,145,000
Interest rate swaps - Mark-to-market and amortization of losses 0 3,000
Share-based compensation 790,000 582,000
(Gain) loss on foreign currency translation and transaction (1,000) (10,000)
Change in operating assets and liabilities:    
Accounts receivable (3,163,000) 12,964,000
Inventories (1,163,000) 1,454,000
Prepaid and other assets (304,000) (456,000)
Accounts payable 2,756,000 (4,770,000)
Increase (Decrease) in Income Taxes Receivable 0 670,000
Accrued and other liabilities 290,000 (2,374,000)
Post retirement benefits liability (232,000) (147,000)
Net cash provided by operating activities 6,030,000 15,411,000
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,381,000) (1,626,000)
Net cash used in investing activities (1,381,000) (1,626,000)
Cash flows from financing activities:    
Excess tax benefit from equity plans 0 (16,000)
Payments related to purchase of treasury stock (372,000) (134,000)
Net cash used in financing activities (1,872,000) (2,364,000)
Net change in cash and cash equivalents 2,777,000 11,421,000
Cash and cash equivalents at beginning of period 28,285,000 8,943,000
Cash and cash equivalents at end of period 31,062,000 20,364,000
Cash paid for:    
Interest (net of amounts capitalized) 129,000 157,000
Income taxes 2,212,000 1,409,000
Non Cash:    
Fixed asset purchases in accounts payable 158,000 51,000
Term Loan [Member]    
Cash flows from financing activities:    
Repayments of Short-term Debt 1,500,000 1,500,000
Capex Loan [Member]    
Cash flows from financing activities:    
Repayments of Short-term Debt $ 0 $ 714,000