Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ (895)	$ 2,322
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	3,174	3,193
Impairment of right of use assets	612
Payment of earnout related to Ambrell acquisition		(12,167)
Provision for excess and obsolete inventory	444	391
Foreign exchange loss	26	3
Amortization of deferred compensation related to stock-based awards	671	884
Proceeds from sale of demonstration equipment, net of gain	82	167
Loss on disposal of property and equipment	22	55
Deferred income tax benefit	(341)	(426)
Changes in assets and liabilities:
Trade accounts receivable	887	1,244
Inventories	(717)	(1,058)
Prepaid expenses and other current assets	35	(129)
Restricted certificates of deposit		35
Other assets	(4)	(1)
Accounts payable	430	197
Accrued wages and benefits	(70)	(912)
Accrued professional fees	(31)	31
Customer deposits and deferred revenue	(62)	(797)
Accrued sales commission	29	(261)
Operating lease liabilities	(1,297)	(1,378)
Domestic and foreign income taxes payable	(48)	171
Other current liabilities	301	31
Net cash provided by (used in) operating activities	3,248	(8,405)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(658)	(620)
Proceeds from sale of property and equipment	10
Net cash used in investing activities	(648)	(620)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Paycheck Protection Program loans	2,829
Repayments of Paycheck Protection Program loans	(2,829)
Proceeds from revolving credit facility	2,800
Repayments of revolving credit facility	(2,800)
Repurchases of common stock	(74)	(1,142)
Net cash used in financing activities	(74)	(1,142)
Effects of exchange rates on cash	139	(82)
Net cash provided by (used in) all activities	2,665	(10,249)
Cash and cash equivalents at beginning of period	7,612	17,861
Cash and cash equivalents at end of period	10,277	7,612
Cash payments for:
Domestic and foreign income taxes	54	535
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Issuance of unvested shares of restricted stock	971	837
Forfeiture of unvested shares of restricted stock	$ (405)	$ (88)