Business Segments (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	$ 1,402	$ 2,357	$ 2,757
Depreciation and amortization:
Depreciation and amortization	6,462	7,865	9,758
Learning Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	548	768	1,094
Depreciation and amortization:
Depreciation and amortization	2,403	3,189	3,754
Professional and Technical Services [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	146	269	451
Depreciation and amortization:
Depreciation and amortization	797	1,152	1,333
Sandy Training and Marketing [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	13	77	8
Depreciation and amortization:
Depreciation and amortization	429	465	427
Performance Readiness Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	39	496	50
Depreciation and amortization:
Depreciation and amortization	1,530	1,446	2,029
Corporate and Other [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	656	747	1,154
Depreciation and amortization:
Depreciation and amortization	$ 1,303	$ 1,613	$ 2,215