Annual report pursuant to Section 13 and 15(d)

Lease Obligations (Details Textual)

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Lease Obligations (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 7,245    
Operating Leases, Rent Expense, Net, Total $ 486 $ 400 $ 342
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years    
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years    
Capital Lease Obligations [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 166    
Debt Instrument, Interest Rate, Stated Percentage 4.70%    
Debt Instrument, Maturity Date Jul. 01, 2020    
Debt Instrument Minimum Monthly Payments $ 3