Contract Receivables (Details) (USD $)	1 Months Ended	6 Months Ended
	Jul. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Contract Receivables [Abstract]
Maximum term of contract receivables (in months)		12 months
Components of contract receivables [Abstract]
Billed receivables		$ 8,472,000	$ 19,040,000
Recoverable costs and accrued profit not billed		5,972,000	5,519,000
Allowance for doubtful accounts		(25,000)	(2,000)
Total contract receivables, net		14,419,000	24,557,000
Unbilled Contract Receivables Billed during July 2014	$ 1,200,000
Contract Receivable [Member] | China Nuclear Power Engineering Company [Member]
Concentration Risk [Line Items]
Percentage of contract receivables accounted by major customers (in hundredths)		13.00%	4.90%
Contract Receivable [Member] | Slovenske elektrarne, a.s. [Member]
Concentration Risk [Line Items]
Percentage of contract receivables accounted by major customers (in hundredths)		2.10%	35.90%