Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 9,721,000	$ 9,698,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,602,000	2,834,000
Realized gain on foreign currency exchange rate	(264,000)
Provision for bad debts - accounts receivable	410,000	232,000
Share-based compensation expense	1,481,000	1,285,000
Deferred income tax benefit	(2,141,000)	(1,361,000)
Loss on sales of property, plant and equipment		13,000
Accretion of acquisition-related contingent liability	126,000	92,000
Changes in assets and liabilities, net of acquisition of business:
Accounts receivable - trade	(6,656,000)	(7,335,000)
Accounts receivable - other	417,000	1,047,000
Inventories	(1,900,000)	(4,002,000)
Prepaid expenses and other current assets	(1,281,000)	(316,000)
Other assets	(100,000)	(1,043,000)
Accounts payable	1,374,000	5,791,000
Other current liabilities	832,000	(890,000)
Long-term pension liability	570,000	(333,000)
Other long-term liabilities	(20,000)	(100,000)
Net cash provided by operating activities	6,171,000	5,612,000
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(6,596,000)	(4,118,000)
Acquisition of business, net of acquired cash	(15,161,000)
Net cash used in investing activities	(21,757,000)	(4,118,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	108,175,000	44,460,000
Repayment of long-term debt	(87,620,000)	(45,365,000)
Payment of cash dividends	(3,487,000)	(3,128,000)
Payment of contingent liability	(1,800,000)	(1,200,000)
Proceeds received on exercise of stock options	1,109,000	1,501,000
Excess tax benefit from exercise of stock options and SARS	1,198,000	726,000
Common stock reacquired and retired	(316,000)
Net cash provided by (used in) financing activities	17,259,000	(3,006,000)
Effect of currency exchange rates on cash	91,000
Net increase (decrease) in cash and cash equivalents	1,764,000	(1,512,000)
Cash and cash equivalents balance, beginning of year	1,036,000	4,586,000
Cash and cash equivalents balance, end of period	$ 2,800,000	$ 3,074,000