Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 5,515	$ (901)	$ 7,379	$ 4,862
Adjustment to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	2,749	3,459	5,520	6,956
Unrealized foreign currency loss			258	746
Net gain on interest rate swaps			(248)	(104)
Earnout payments				(2,050)
Gain on sale of property and equipment				(9)
Loss (gain) on divestitures, net of selling costs		73	70	(11,104)
Debt discount amortization			847	582
Share-based compensation expense			1,756	1,488
Bad debt expense	300	500	394	646
Inventory reserve expense			361	444
Deferred income tax benefit			(337)	(744)
Changes in operating assets and liabilities, net of divestitures:
Accounts receivable			(7,046)	(6,539)
Costs and estimated earnings in excess of billings on uncompleted contracts			(2,416)	(2,911)
Inventories			(1,929)	(1,629)
Prepaid expense and other current assets			(3,366)	2,407
Deferred charges and other assets			(1,703)	(219)
Accounts payable and accrued expenses			(8,291)	12,605
Billings in excess of costs and estimated earnings on uncompleted contracts			1,854	3,110
Income taxes payable			(1,656)	1,589
Other liabilities			(2,744)	(291)
Net cash (used in) provided by operating activities			(11,297)	9,835
Cash flows from investing activities:
Acquisitions of property and equipment			(1,201)	(591)
Net cash proceeds from divestitures				30,692
Proceeds from sale of property and equipment				112
Net cash (used in) provided by investing activities			(1,201)	30,213
Cash flows from financing activities:
Net borrowings (repayments) on revolving credit lines			853	(3,792)
Repayments of debt			(1,700)	(30,756)
Deferred financing fees paid			1,117
Proceeds from lease financing transaction				800
Payments on finance leases and financing liability			(232)	(344)
Proceeds from employee stock purchase plan and exercise of stock options			75	18
Net cash used in financing activities			(2,121)	(34,074)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			136	(793)
Net (decrease) increase in cash, cash equivalents and restricted cash			(14,483)	5,181
Cash, cash equivalents and restricted cash at beginning of period			44,438	30,659	$ 30,659
Cash, cash equivalents and restricted cash at end of period	$ 29,955	$ 35,840	29,955	35,840	$ 44,438
Cash paid during the period for:
Interest			2,300	2,924
Income taxes			$ 3,582	3,318
Non-cash transaction:
Net consideration receivable from divestiture				$ 2,685