Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ 9,342	$ 8,461
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	4,683	4,734
Provision for excess and obsolete inventory	544	771
Foreign exchange (gain) loss	(9)	109
Amortization of deferred compensation related to stock-based awards	2,047	1,787
Discount on shares sold under Employee Stock Purchase Plan	(31)	(36)
Proceeds from sale of demonstration equipment, net of gain	167	68
Loss on disposal of property and equipment	11	0
Deferred income tax benefit	(1,157)	(1,659)
Adjustment to contingent consideration liability	(294)	0
Changes in assets and liabilities:
Trade accounts receivable	2,991	(4,886)
Inventories	2,027	(10,631)
Prepaid expenses and other current assets	(535)	(243)
Other assets	(686)	(2)
Operating lease liabilities	(1,712)	(1,363)
Accounts payable	(1,811)	2,875
Accrued wages and benefits	231	(118)
Accrued professional fees	339	(157)
Customer deposits and deferred revenue	(759)	(1,464)
Accrued sales commission	(421)	621
Domestic and foreign income taxes payable	(371)	(573)
Other current liabilities	231	184
Deferred revenue, net of current portion	1,331	0
Other liabilities	(17)	61
Net cash provided by (used in) operating activities	16,203	(1,389)
CASH FLOWS FROM INVESTING ACTIVITIES
Payment of contingent consideration related to Z-Sciences acquisition	0	(179)
Refund of final working capital adjustment related to Acculogic	0	371
Purchase of property and equipment	(1,291)	(1,365)
Purchase of short term investments	0	(3,494)
Sales of short term investments	0	3,494
Net cash used in investing activities	(1,291)	(1,173)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from public offering of common stock	19,244	0
Proceeds from stock options exercised	978	38
Proceeds from shares sold under Employee Stock Purchase Plan	174	197
Settlement of employee tax liabilities in connection with treasury stock transaction	(687)	(10)
Net cash provided by (used in) financing activities	15,609	(3,733)
Effects of exchange rates on cash	163	(324)
Net cash provided by (used in) all activities	30,684	(6,619)
Cash, cash equivalents and restricted cash at beginning of period	14,576	21,195
Cash, cash equivalents and restricted cash at end of period	45,260	14,576
Cash payments for:
Domestic and foreign income taxes	3,240	3,924
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Stock Issued	1,601	1,138
Forfeiture of unvested shares of restricted stock	(176)	(54)
Term Note [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Repayments of Term Note	$ (4,100)	$ (3,958)