Segment Information, Geographic Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Information [Abstract]
Percentage of revenues derived from customers in the nuclear power industry	89.00%	90.00%
Segment Reporting Information [Line Items]
Total revenue	$ 57,620	$ 82,975
Operating loss	(9,538)	(7,419)
Assets	$ 39,190	$ 58,509
Percentage of revenues derived from international sales	17.00%	16.00%
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0
Geography Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(496)	(747)
Operating loss	0	0
Assets	(128,352)	(131,937)
Performance Improvement Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue	32,790	45,776
Operating loss	(2,683)	(205)
Assets	25,845	41,550
Nuclear Industry Training and Consulting [Member]
Segment Reporting Information [Line Items]
Total revenue	24,830	37,199
Operating loss	(2,076)	(1,617)
Assets	13,345	16,959
United States [Member]
Segment Reporting Information [Line Items]
Total revenue	57,093	82,220
Operating loss	(13,041)	(7,710)
Assets	161,672	184,115
United States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	56,628	81,597
United States [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	465	623
Europe [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating loss	3,231	54
Assets	2,679	3,526
Europe [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0
Europe [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0
Asia [Member]
Segment Reporting Information [Line Items]
Total revenue	1,023	1,502
Operating loss	272	237
Assets	3,191	2,805
Asia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	992	1,378
Asia [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 31	$ 124