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Segment Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Segment
Jun. 30, 2016
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Number of reportable business segments | Segment     2  
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue $ 17,125 $ 12,415 $ 33,467 $ 25,391
Change in fair value of contingent consideration, net (43) (224) (297) (155)
Operating income (loss) 762 227 705 442
Interest income, net 18 13 45 40
Gain (loss) on derivative instruments, net 315 (17) 155 (135)
Other income (expense), net (34) (4) (37) 98
Income (loss) before income taxes 1,061 219 868 445
Performance Improvement Solutions [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue 11,686 8,323 21,356 17,166
Operating income (loss) 399 (432) (340) (474)
Nuclear Industry Training and Consulting [Member]        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total revenue 5,439 4,092 12,111 8,225
Operating income (loss) $ 406 $ 883 $ 1,342 $ 1,071
Minimum [Member] | Performance Improvement Solutions [Member]        
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Contract term     9 months  
Maximum [Member] | Performance Improvement Solutions [Member]        
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]        
Contract term     24 years