CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Sales:
Net sales	$ 26,623	$ 28,673	$ 52,037	$ 57,940
Costs and expenses:
Research and development	916	2,326	2,103	5,364
Sales, marketing and support	5,010	5,334	9,970	10,718
General and administrative	3,580	4,134	7,115	9,425
Total costs and expenses	26,993	31,562	54,650	64,627
Loss from operations	(370)	(2,889)	(2,613)	(6,687)
Interest income	579	876	1,146	1,787
Other income (expense), net	826	(366)	817	(564)
Income (loss) before income tax expense (benefit)	1,035	(2,379)	(650)	(5,464)
Income tax expense (benefit)	105	(3)	130	75
Net income (loss)	$ 930	$ (2,376)	$ (780)	$ (5,539)
Net income (loss) per common share
Basic (in dollars per share)	$ 0.05	$ (0.12)	$ (0.04)	$ (0.29)
Diluted (in dollars per share)	$ 0.05	$ (0.12)	$ (0.04)	$ (0.29)
Weighted average number of common shares outstanding:
Basic (in shares)	19,401	19,381	19,446	19,333
Diluted (in shares)	19,441	19,381	19,446	19,333
Service
Sales:
Net sales	$ 23,049	$ 24,674	$ 44,691	$ 49,712
Costs and expenses:
Cost of product and service sales	14,210	15,469	28,445	29,513
Product
Sales:
Net sales	3,574	3,999	7,346	8,228
Costs and expenses:
Cost of product and service sales	$ 3,277	$ 4,299	$ 7,017	$ 9,607