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Segment Information, Geographic Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Segment Information [Abstract]      
Percentage of revenues derived from customers in the nuclear power industry   91.00% 83.00%
Segment Reporting Information [Line Items]      
Total revenue $ 92,249 $ 92,249 $ 70,880 [1]
Operating income (loss)   1,366 229
Assets 61,440 $ 61,440 $ 56,182
Percentage of revenues derived from international sales   15.00% 16.00%
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenue   $ 0 $ 0
Assets 0 0 0
Geography Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenue   (2,245) (2,621)
Operating income (loss)   0 0
Assets (117,251) (117,251) (101,905)
Performance Improvement Solutions [Member]      
Segment Reporting Information [Line Items]      
Total revenue   42,954 39,899
Operating income (loss)   2,640 (3,191)
Assets 40,353 40,353 33,434
Nuclear Industry Training and Consulting [Member]      
Segment Reporting Information [Line Items]      
Total revenue   49,295 30,981
Operating income (loss)   (1,274) 3,420
Assets 21,087 21,087 22,748
United States [Member]      
Segment Reporting Information [Line Items]      
Total revenue   91,025 68,202
Operating income (loss)   2,902 1,930
Assets 171,206 171,206 148,717
United States [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total revenue   88,979 66,249
United States [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenue   2,046 1,953
Europe [Member]      
Segment Reporting Information [Line Items]      
Total revenue   2,150 3,196
Operating income (loss)   (1,116) (1,585)
Assets 3,893 3,893 5,057
Europe [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total revenue   2,150 3,196
Europe [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenue   0 0
Asia [Member]      
Segment Reporting Information [Line Items]      
Total revenue   1,319 2,103
Operating income (loss)   (420) (116)
Assets $ 3,592 3,592 4,313
Asia [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total revenue   1,120 1,435
Asia [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenue   199 $ 668
UK [Member]      
Segment Reporting Information [Line Items]      
Total revenue   200  
Sweden [Member]      
Segment Reporting Information [Line Items]      
Total revenue   $ 1,900  
[1] Prior period amounts have not been adjusted under the modified retrospective transition method for the adoption of ASC 606.