Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,835,000	$ 2,442,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	1,358,000	1,103,000
Provision for bad debts - accounts receivable	146,000	67,000
Share-based compensation expense	842,000	877,000
Deferred income tax benefit	(320,000)	(479,000)
Gain on sale of property, plant and equipment	(1,018,000)
Accretion of acquisition-related contingent liability	44,000	35,000
Changes in assets and liabilities:
Accounts receivable - trade	7,164,000	(3,650,000)
Accounts receivable - other	689,000	(43,000)
Inventories	(1,078,000)	1,001,000
Prepaid expenses and other current assets	(1,892,000)	(184,000)
Other assets	(1,522,000)	(281,000)
Accounts payable	(590,000)	(1,833,000)
Other current liabilities	(426,000)	(2,291,000)
Long-term pension liability	(920,000)	485,000
Other long-term liabilities	696,000	20,000
Net cash provided by (used in) operating activities	7,008,000	(2,731,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(930,000)	(2,707,000)
Proceeds from disposals of property, plant and equipment	2,808,000
Purchase of business net of acquired cash		(15,252,000)
Net cash provided by (used in) investing activities	1,878,000	(17,959,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	71,209,000	74,363,000
Repayment of long-term debt	(71,367,000)	(50,250,000)
Payment of cash dividends	(1,231,000)	(1,133,000)
Payment of contingent liability	(1,800,000)	(1,800,000)
Proceeds received on exercise of stock options	105,000	322,000
Tax withholding on exercise of stock rights	(201,000)	(124,000)
Net cash provided by (used in) financing activities	(3,215,000)	21,913,000
Effect of currency exchange rates on cash	52,000	30,000
Net increase in cash and cash equivalents	5,723,000	1,253,000
Cash and cash equivalents balance, beginning of year	3,649,000	1,036,000
Cash and cash equivalents balance, end of period	9,372,000	2,289,000
Restricted Stock [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Tax benefit from vesting of acquisition related restricted stock	$ 70,000	$ 535,000