Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

v3.8.0.1
Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Leases, Rent Expense $ 1.0 $ 0.9
Surety Bond [Member]    
Long-term Debt $ 86.0