Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 2,322	$ 3,037
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	3,193	1,871
Payment of earnout related to Ambrell acquisition	(12,167)	(1,710)
Adjustment to earnout payable		12,645
Adjustment to contingent consideration liability		(5,744)
Provision for excess and obsolete inventory	391	285
Foreign exchange loss	3	165
Amortization of deferred compensation related to stock-based awards	884	653
Proceeds from sale of demonstration equipment, net of gain	167	186
Loss on disposal of property and equipment	55	61
Deferred income tax expense (benefit)	(426)	83
Changes in assets and liabilities:
Trade accounts receivable	1,244	1,414
Inventories	(1,058)	(1,847)
Prepaid expenses and other current assets	(129)	(102)
Restricted certificates of deposit	35
Other assets	(1)	1
Accounts payable	197	(245)
Accrued wages and benefits	(912)	143
Accrued professional fees	31	58
Customer deposits and deferred revenue	(797)	376
Accrued sales commission	(261)	174
Operating lease liabilities	(1,378)
Domestic and foreign income taxes payable	171	(495)
Contingent liability for repayment of state and local grant funds received	263	200
Federal transition tax payable		(436)
Other current liabilities	(232)	187
Net cash provided by (used in) operating activities	(8,405)	10,960
CASH FLOWS FROM INVESTING ACTIVITIES
Payment of earnout for 2017 related to Ambrell acquisition		(4,123)
Purchase of property and equipment	(620)	(2,212)
Net cash used in investing activities	(620)	(6,335)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchases of common stock	(1,142)
Net cash used in financing activities	(1,142)
Effects of exchange rates on cash	(82)	(54)
Net cash provided by (used in) all activities	(10,249)	4,571
Cash and cash equivalents at beginning of period	17,861	13,290
Cash and cash equivalents at end of period	7,612	17,861
Cash payments for:
Domestic and foreign income taxes	595	2,855
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Issuance of unvested shares of restricted stock	837	788
Forfeiture of unvested shares of restricted stock	$ (88)