Segment Information, Geographic Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Information [Abstract]
Percentage of revenues derived from customers in the nuclear power industry	92.00%	89.00%
Segments, Geographical Areas [Abstract]
Revenue	$ 45,041	$ 47,734
Operating loss	(6,818)	(14,406)
Net assets	$ 22,805	$ 26,496
Percentage of revenues derived from international sales	12.00%	16.00%
United States [Member]
Segments, Geographical Areas [Abstract]
Operating loss	$ (6,676)	$ (14,225)
Net assets	21,202	24,631
United States [Member] | Operating Segments [Member]
Segments, Geographical Areas [Abstract]
Revenue	44,040	46,622
Asia [Member]
Segments, Geographical Areas [Abstract]
Operating loss	(142)	(181)
Net assets	1,603	1,865
Asia [Member] | Operating Segments [Member]
Segments, Geographical Areas [Abstract]
Revenue	$ 1,001	$ 1,112