Subsequent Events (Details) $ in Millions		12 Months Ended
	May 11, 2018 USD ($) Employees	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Percentage of revenue from nuclear industry		85.00%
Business Combination, Consideration Transferred, Liabilities Incurred	$ 10.3
Line of Credit Facility, Expiration Period	5 years
Principal amount of the line of credit	$ 5.0
Long-term Debt, Gross	25.0
True North [Member]
Subsequent Event [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 11.0
Cash purchase price	9.8
Cash consideration in escrow	1.5
Cash Payment to sellers on acquisition date	$ 8.3
Number of employees of the acquiree | Employees	60
Maximum [Member]
Subsequent Event [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	27500.00%
Minimum [Member]
Subsequent Event [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	20000.00%