Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net (loss) income	$ (4,605,000)	$ 723,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	11,641,000	9,458,000
(Insurance recoveries) asset impairment, net	0	(841,000)
Stock-based compensation	2,360,000	1,734,000
Stock-based compensation - executive retirement	(67,000)	0
(Gain) loss on disposition of assets	(88,000)	334,000
Deferred income taxes	36,000	0
Amortization of deferred financing costs	283,000	315,000
Write-off of deferred financing costs	504,000	0
Bad debt expense	0	80,000
Changes in operating assets and liabilities
Accounts receivable	11,368,000	5,629,000
Inventory	(146,000)	(253,000)
Prepaid expenses and other current assets	176,000	(1,820,000)
Accounts payable and accrued liabilities	(6,078,000)	2,620,000
Income taxes payable	0	(195,000)
Net cash provided by operating activities	15,384,000	17,784,000
Cash flows from investing activities
Purchases of property, plant and equipment	(10,521,000)	(58,215,000)
Proceeds from insurance claims	188,000	2,899,000
Proceeds from the sale of property, plant and equipment	747,000	351,000
Net cash used in investing activities	(9,586,000)	(54,965,000)
Cash flows from financing activities
Borrowings under credit facility	34,775,000	89,566,000
Repayments under credit facility	(81,129,000)	(50,724,000)
Public offering proceeds, net of offering costs of $3,305	42,983,000	0
Purchase of treasury stock	(183,000)	0
Financing costs paid	(217,000)	(164,000)
Payments for capital lease obligations	(285,000)	0
Net cash (used in) provided by financing activities	(4,056,000)	38,678,000
Net increase in cash and cash equivalents	1,742,000	1,497,000
Beginning of period	5,344,000	10,757,000
End of period	7,086,000	12,254,000
Supplemental disclosure of cash flow information
Cash paid during the period for interest	1,426,000	1,379,000
Cash paid during the period for income taxes	0	135,000
Supplemental disclosure of non-cash investing and financing activities
Stock-based compensation capitalized as property, plant and equipment	0	423,000
Change in property, plant and equipment purchases in accounts payable	(2,577,000)	(15,776,000)
Additions to property, plant and equipment through capital leases	$ 965,000	$ 0