Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ 4,821	$ (973)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	1,461	1,584
Provision for excess and obsolete inventory	93	305
Foreign exchange loss	4	37
Amortization of deferred compensation related to stock-based awards	723	395
Loss on disposal of property and equipment	27	0
Proceeds from sale of demonstration equipment, net of gain	(14)	0
Deferred income tax benefit	(81)	(209)
Changes in assets and liabilities:
Trade accounts receivable	(4,419)	(205)
Inventories	(1,326)	(1,054)
Prepaid expenses and other current assets	246	359
Restricted certificates of deposit	40	0
Other assets	(6)	(4)
Accounts payable	1,105	635
Accrued wages and benefits	663	(133)
Customer deposits and deferred revenue	499	217
Accrued sales commissions	399	41
Operating lease liabilities	(641)	(652)
Domestic and foreign income taxes payable	284	(100)
Other current liabilities	(9)	(157)
Other liabilities	(7)	(5)
Net cash provided by operating activities	3,862	81
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(463)	(190)
Net cash used in investing activities	(463)	(190)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock options exercised	1,002	0
Repurchases of common stock	0	(74)
Proceeds from Paycheck Protection Program loans	0	2,829
Repayments of Paycheck Protection Program loans	0	(2,829)
Proceeds from revolving credit facility	0	2,800
Repayments of revolving credit facility	0	(2,800)
Net cash provided by (used in) financing activities	1,002	(74)
Effects of exchange rates on cash	(53)	(5)
Net cash provided by (used in) all activities	4,348	(188)
Cash and cash equivalents at beginning of period	10,277	7,612
Cash and cash equivalents at end of period	14,625	7,424
Cash payments for:
Domestic and foreign income taxes	$ 610	$ 73