Long-term Debt and Capital Lease Obligations, Line of Credit Facility (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 90,000,000	$ 90,000,000
Reserve Against line of Credit	15,000,000	15,000,000
Line of Credit Facility, Remaining Borrowing Capacity	75,000,000	75,000,000
Letters of Credit Outstanding, Amount	1,138,000	1,138,000
Line of Credit Facility, Current Borrowing Capacity	$ 54,781,000	$ 54,781,000
Line of Credit Facility, Borrowing Capacity, Description	The maximum amount, less reserves, available for borrowing at levels below $30,000 is based on a sum of 45% of eligible receivables, 30% of eligible inventories and an additional amount of eligible equipment up to 20% of total borrowings under the facility. The maximum amount, less reserves, available for borrowing at levels above $30,000 is based on a sum of 75% of eligible receivables, 45% of eligible inventories and an additional amount of eligible equipment up to 20% of total borrowings under the facility.
Line of Credit Facility, Interest Rate During Period	4.60%
Commitment fee (in hundredths)		0.50%
Federal funds rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		0.50%
One Month Eurodollar [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		1.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)		0.375%
Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		3.00%
Minimum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		2.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee (in hundredths)		0.50%
Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		3.50%
Maximum [Member] | Alternate Base Rate [Member]
Line of Credit Facility [Line Items]
Spread over reference rate (in hundredths)		2.50%