Segment Information, Geographic Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Segment Information [Abstract]
Percentage of revenues derived from customers in the nuclear power industry	89.00%	91.00%
Segments, Geographical Areas [Abstract]
Revenue	$ 47,734	$ 55,183
Operating loss	(14,406)	(5,974)
Net assets	$ 26,496	$ 39,051
Percentage of revenues derived from international sales	16.00%	12.00%
United States [Member]
Segments, Geographical Areas [Abstract]
Operating loss	$ (14,225)	$ (3,351)
Net assets	24,631	35,932
United States [Member] | Operating Segments [Member]
Segments, Geographical Areas [Abstract]
Revenue	46,622	54,203
Europe [Member]
Segments, Geographical Areas [Abstract]
Operating loss	0	(1,746)
Net assets	0	0
Europe [Member] | Operating Segments [Member]
Segments, Geographical Areas [Abstract]
Revenue	0	0
Asia [Member]
Segments, Geographical Areas [Abstract]
Operating loss	(181)	(877)
Net assets	1,865	3,119
Asia [Member] | Operating Segments [Member]
Segments, Geographical Areas [Abstract]
Revenue	$ 1,112	$ 980