Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 5,157	$ 6,267
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	4,211	3,646
Provision for bad debts - accounts receivable	361	323
Share-based compensation expense	1,032	1,490
Deferred income tax benefit (provision)	(1,979)	302
Gain on sale of property, plant and equipment	(3)
Change in fair value of acquisition-related contingent liabilities	417	(840)
Changes in assets and liabilities, net of acquisition of business:
Accounts receivable - trade	(7,230)	(3,492)
Accounts receivable - other	280	(674)
Contract assets	5,562	(972)
Inventories	2,113	2,953
Prepaid expenses and other current assets	(2,625)	242
Other assets	(2,102)	(1,827)
Accounts payable and other current liabilities	(14)	(7,368)
Long-term pension liability	812	195
Other long-term liabilities	759	(497)
Net cash provided by (used in) operating activities	6,751	(252)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(4,979)	(2,414)
Proceeds from disposals of property, plant and equipment	3
Acquisition of businesses, net of acquired cash		(85,597)
Net cash used in investing activities	(4,976)	(88,011)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	94,466	146,157
Repayment of long-term debt	(88,667)	(56,289)
Payment of cash dividends	(3,023)	(2,827)
Payment of acquisition-related contingent liability	(961)	(3,033)
Proceeds received on exercise of stock options	280	405
Tax benefit from vesting of acquisition-related restricted stock	30	105
Tax withholding on exercise of stock rights		(17)
Common stock reacquired and retired	(1,036)
Net cash provided by financing activities	1,089	84,501
Effect of currency exchange rates on cash	41	(204)
Net increase (decrease) in cash and cash equivalents	2,905	(3,966)
Cash and cash equivalents balance, beginning of year	5,362	8,130
Cash and cash equivalents balance, end of period	$ 8,267	$ 4,164