Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ 2,212	$ (1,143)
Adjustments to reconcile net earnings (loss) to net cash used in operating activities:
Depreciation and amortization	740	791
Provision for excess and obsolete inventory	39	171
Foreign exchange loss	8	38
Amortization of deferred compensation related to stock-based awards	269	187
Loss on disposal of property and equipment	22
Proceeds from sale of demonstration equipment, net of gain	7
Deferred income tax benefit	(9)	(93)
Changes in assets and liabilities:
Trade accounts receivable	(5,082)	1,188
Inventories	(783)	(714)
Prepaid expenses and other current assets	212	117
Other assets	(8)	(4)
Accounts payable	1,235	316
Accrued wages and benefits	103	(543)
Accrued professional fees	(261)	(105)
Customer deposits and deferred revenue	799	152
Accrued sales commissions	232	78
Operating lease liabilities	(343)	(323)
Domestic and foreign income taxes payable	335	(207)
Other current liabilities	(57)	(25)
Other liabilities	(7)
Net cash used in operating activities	(337)	(119)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(388)	(80)
Net cash used in investing activities	(388)	(80)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock options exercised	717
Repurchases of common stock		(74)
Net cash provided by (used in) financing activities	717	(74)
Effects of exchange rates on cash	(74)	(21)
Net cash used in all activities	(82)	(294)
Cash and cash equivalents at beginning of period	10,277	7,612
Cash and cash equivalents at end of period	10,195	7,318
Cash payments for:
Domestic and foreign income taxes	$ 41	$ 50