Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,376	$ 2,450
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	2,060	1,626
Provision for bad debts - accounts receivable	138	157
Share-based compensation expense	481	1,052
Deferred income tax benefit (provision)	(1,182)	162
Gain on sale of property, plant and equipment	(3)
Change in fair value of acquisition-related contingent liabilities	201	209
Changes in assets and liabilities:
Accounts receivable - trade	309	2,147
Accounts receivable - other	312	(259)
Contract assets	1,876	(3,780)
Inventories	1,522	3,742
Prepaid expenses and other current assets	(2,197)	27
Other assets	(1,503)	(1,564)
Accounts payable and other current liabilities	(12)	(7,132)
Long-term pension liability	262	97
Other long-term liabilities	1,099	450
Net cash provided by (used in) operating activities	5,739	(616)
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(1,723)	(1,055)
Proceeds from disposals of property, plant and equipment	3
Net cash used in investing activities	(1,720)	(1,055)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	54,856	31,657
Repayment of long-term debt	(55,161)	(24,642)
Payment of cash dividends	(1,515)	(1,402)
Payment of acquisition-related contingent liability		(2,000)
Proceeds received on exercise of stock options	210	257
Tax benefit from vesting of acquisition-related restricted stock	30	105
Tax withholding on exercise of stock rights		(17)
Common stock reaquired and retired	(992)
Net cash (used in) provided by financing activities	(2,572)	3,958
Effect of currency exchange rates on cash	15	25
Net increase in cash and cash equivalents	1,462	2,312
Cash and cash equivalents balance, beginning of year	5,362	8,130
Cash and cash equivalents balance, end of period	$ 6,824	$ 10,442