Note 2 - Revenue (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three months ended				Nine months ended
	September 30,				September 30,
	2023		2022		2023		2022
Telecommunication products	$	918	$	1,317	$	3,109	$	3,828
Display products		727		558		2,061		2,223
Specialty glass products		560		516		1,384		1,494
Environmental substrate and filter products		420		393		1,260		1,130
Life science products		221		297		690		908
Polycrystalline silicon products		230		288		765		877
All other products		97		119		325		323
Total revenue	$	3,173	$	3,488	$	9,594	$	10,783