Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 4,395	$ 3,523
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	840	523
Payment of earnout for 2017 related to Ambrell acquisition	(1,710)
Adjustment to earnout payable for 2018	1,016
Provision for excess and obsolete inventory	129	90
Foreign exchange gain	(49)	(29)
Amortization of deferred compensation related to stock-based awards	292	186
Loss on disposal of property and equipment	11
Proceeds from sale of demonstration equipment, net of gain	99	32
Deferred income tax expense (benefit)	(142)	59
Changes in assets and liabilities:
Trade accounts receivable	606	(2,884)
Inventories	(2,025)	(697)
Prepaid expenses and other current assets	143	(84)
Other assets	(4)	(3)
Accounts payable	707	35
Accrued wages and benefits	(488)	(134)
Customer deposits and deferred revenue	(153)	(19)
Domestic and foreign income taxes payable	86	324
Long-term portion of Federal transition tax payable	(436)
Other current liabilities	186	154
Net cash provided by operating activities	3,503	1,076
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired		(21,962)
Purchase of property and equipment	(1,920)	(203)
Proceeds from sale of property and equipment		7
Net cash used in investing activities	(1,920)	(22,158)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of earnout for 2017 related to Ambrell acquisition	(4,123)
Repurchases of common stock		(62)
Net cash used in financing activities	(4,123)	(62)
Effects of exchange rates on cash	(37)	129
Net cash used in all activities	(2,577)	(21,015)
Cash and cash equivalents at beginning of period	13,290	28,611
Cash and cash equivalents at end of period	10,713	7,596
Cash payments for:
Domestic and foreign income taxes	1,425	1,583
Net cash paid for acquisition		21,962
Ambrell [Member]
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired		(21,962)
Cash payments for:
Fair value of assets acquired, net of cash		22,652
Liabilities assumed		(8,599)
Goodwill resulting from acquisition		12,032
Contingent consideration		(4,123)
Net cash paid for acquisition		$ 21,962