Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ 7,283	$ (895)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	3,145	3,174
Impairment of right-of-use assets	0	612
Provision for excess and obsolete inventory	203	444
Foreign exchange loss	34	26
Amortization of deferred compensation related to stock-based awards	1,450	671
Proceeds from sale of demonstration equipment, net of gain	145	82
Loss on disposal of property and equipment	50	22
Deferred income tax benefit	(489)	(341)
Changes in assets and liabilities:
Trade accounts receivable	(4,775)	887
Inventories	(2,544)	(717)
Prepaid expenses and other current assets	(416)	35
Restricted certificates of deposit	40	0
Other assets	(9)	(4)
Accounts payable	1,177	430
Accrued wages and benefits	1,220	(70)
Accrued professional fees	267	(31)
Customer deposits and deferred revenue	4,755	(62)
Accrued sales commission	280	29
Operating lease liabilities	(1,218)	(1,297)
Domestic and foreign income taxes payable	301	(48)
Other current liabilities	(59)	301
Other liabilities	(6)	0
Net cash provided by operating activities	10,834	3,248
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	(20,378)	0
Purchase of property and equipment	(994)	(658)
Proceeds from sale of property and equipment	0	10
Net cash used in investing activities	(21,372)	(648)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock options exercised and shares sold through Employee Stock Purchase Plan	1,633	0
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)
Repurchases of common stock	0	(74)
Net cash provided by (used in) financing activities	21,733	(74)
Effects of exchange rates on cash	(277)	139
Net cash provided by all activities	10,918	2,665
Cash and cash equivalents at beginning of period	10,277	7,612
Cash and cash equivalents at end of period	21,195	10,277
Cash payments for:
Domestic and foreign income taxes	1,322	54
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Issuance of unvested shares of restricted stock	1,541	971
Forfeiture of unvested shares of restricted stock	(164)	(405)
Details of acquisitions:
Fair value of assets acquired, net of cash	17,717
Liabilities assumed	(3,849)
Contingent consideration	(1,109)
Goodwill resulting from acquisitions	7,619
Net cash paid for acquisitions	20,378
Term Note [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from Term Note	20,500	0
Repayments of Term Note	$ (400)	$ 0