Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	$ 2,757	$ 6,714	$ 2,536
Depreciation and amortization:
Depreciation and amortization	9,758	8,617	7,971
Learning Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	1,987	2,788	1,149
Depreciation and amortization:
Depreciation and amortization	6,856	4,990	3,411
Professional and Technical Services [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	291	233	84
Depreciation and amortization:
Depreciation and amortization	738	715	668
Sandy Training and Marketing [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	8	11	38
Depreciation and amortization:
Depreciation and amortization	427	427	428
Performance Readiness Solutions [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	44	553	61
Depreciation and amortization:
Depreciation and amortization	619	778	1,102
Energy Services [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	144	352	273
Depreciation and amortization:
Depreciation and amortization	575	393	511
Corporate and Other [Member]
Additions to property, plant and equipment:
Property, Plant and Equipment, Additions	283	2,777	931
Depreciation and amortization:
Depreciation and amortization	$ 543	$ 1,314	$ 1,851