Business Segments (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	$ 2,734	$ 1,402	$ 2,357
Depreciation and amortization:
Depreciation and amortization	6,974	6,462	7,865
Learning Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	1,174	548	768
Depreciation and amortization:
Depreciation and amortization	2,225	2,403	3,189
Professional and Technical Services [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	480	146	269
Depreciation and amortization:
Depreciation and amortization	749	797	1,152
Sandy Training and Marketing [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	70	13	77
Depreciation and amortization:
Depreciation and amortization	439	429	465
Performance Readiness Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	73	39	496
Depreciation and amortization:
Depreciation and amortization	2,023	1,530	1,446
Corporate and Other [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	937	656	747
Depreciation and amortization:
Depreciation and amortization	$ 1,538	$ 1,303	$ 1,613