Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

v3.7.0.1
Commitments and Contingencies (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Operating Leases, Rent Expense $ 1,100 $ 2,100
Surety Bond [Member]    
Long-term Debt 85,400 85,400
Energy Contracts [Member]    
Other Commitment, Due in Next Twelve Months 84 84
Other Commitment, Due in Second Year $ 42 $ 42