Long-Term Debt (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) Letter	Dec. 31, 2016 USD ($)
Long-Term Debt [Abstract]
Long-term debt	$ 0	$ 0
Performance Bond [Abstract]
Restricted cash, current	$ 1,140,000	1,140,000
Citizen's Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility term	3 years
Principal amount of the line of credit	$ 5,000,000
Percentage of letter of credit fees per annum	1.25%
Percentage of borrowing base equal to eligible accounts receivable	80.00%
Outstanding borrowings	$ 0
Number of letters of credit | Letter	6
Letters of credit, amount outstanding	$ 1,700,000
Line of Credit Facility, Remaining Borrowing Capacity	1,800,000
Fair value of amount outstanding	$ 0
Performance Bond [Abstract]
Number of standby letters of credit | Letter	6
Citizen's Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.25%
BB&T Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Number of letters of credit | Letter	4
Letters of credit, amount outstanding	$ 1,000,000
Restricted Cash and Cash Equivalents	$ 1,100,000	1,100,000
Performance Bond [Abstract]
Number of standby letters of credit | Letter	4
Restricted cash and investments	$ 1,100,000	$ 1,100,000