Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 3,037	$ 975
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	1,871	1,779
Payment of earnout for 2017 related to Ambrell acquisition	(1,710)
Adjustment to earnout payable	12,645	5,355
Adjustment to contingent consideration liability	(5,744)	1,621
Provision for excess and obsolete inventory	285	251
Foreign exchange (gain) loss	165	(146)
Amortization of deferred compensation related to stock-based awards	653	344
Proceeds from sale of demonstration equipment, net of gain	186	152
Loss on disposal of property and equipment	61
Deferred income tax expense (benefit)	83	(1,630)
Changes in assets and liabilities:
Trade accounts receivable	1,414	(2,983)
Inventories	(1,847)	388
Prepaid expenses and other current assets	(102)	(31)
Other assets	1	2
Accounts payable	(245)	(756)
Accrued wages and benefits	143	512
Customer deposits and deferred revenue	376	55
Domestic and foreign income taxes payable	(495)	586
Other current liabilities	419	332
Contingent liability for repayment of state and local grant funds received	200
Federal transition tax payable	(436)	436
Net cash provided by operating activities	10,960	7,242
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of business, net of cash acquired		(21,962)
Payment of earnout for 2017 related to Ambrell acquisition	(4,123)
Purchase of property and equipment	(2,212)	(745)
Proceeds from sale of property and equipment		36
Net cash used in investing activities	(6,335)	(22,671)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchases of common stock		(62)
Net cash used in financing activities		(62)
Effects of exchange rates on cash	(54)	170
Net cash provided by (used in) all activities	4,571	(15,321)
Cash and cash equivalents at beginning of period	13,290	28,611
Cash and cash equivalents at end of period	17,861	13,290
Cash payments for:
Domestic and foreign income taxes	2,855	3,467
Net cash paid for acquisition		21,962
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Issuance of unvested shares of restricted stock	788	432
Forfeiture of unvested shares of restricted stock		(104)
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