Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net (loss) income	$ (414,000)	$ 1,375,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	5,825,000	4,289,000
(Insurance recoveries) asset impairment, net	0	(841,000)
Stock-based compensation	1,155,000	933,000
(Gain) loss on disposition of assets	(125,000)	393,000
Deferred income taxes	4,000	0
Amortization of deferred financing costs	152,000	153,000
Bad debt expense	0	73,000
Changes in operating assets and liabilities
Accounts receivable	3,807,000	1,055,000
Inventory	(47,000)	(67,000)
Prepaid expenses and other current assets	(110,000)	(811,000)
Accounts payable and accrued liabilities	(3,026,000)	(1,080,000)
Income taxes payable	0	(155,000)
Net cash provided by operating activities	7,221,000	5,317,000
Cash flows from investing activities
Purchases of property, plant and equipment	(5,677,000)	(21,283,000)
Proceeds from insurance claims	0	2,899,000
Proceeds from the sale of property, plant and equipment	648,000	93,000
Net cash used in investing activities	(5,029,000)	(18,291,000)
Cash flows from financing activities
Borrowings under credit facility	26,949,000	39,760,000
Repayments under credit facility	(26,937,000)	(26,339,000)
Financing costs paid	0	(161,000)
Payments for capital lease obligations	(138,000)	0
Net cash (used in) provided by financing activities	(126,000)	13,260,000
Net increase in cash and cash equivalents	2,066,000	286,000
Beginning of period	5,344,000	10,757,000
End of period	7,410,000	11,043,000
Supplemental disclosure of cash flow information
Cash paid during the period for interest	944,000	603,000
Supplemental disclosure of non-cash investing and financing activities
Stock-based compensation capitalized as property, plant and equipment	0	221,000
Change in property, plant and equipment purchases in accounts payable	(2,552,000)	7,333,000
Additions to property, plant and equipment through capital leases	$ 929,000	$ 0