Consolidated Statements of Cash Flows (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income	$ 4,005,741us-gaap_NetIncomeLoss	$ 4,301,237us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,402,330	2,088,767
Gain on disposal of equipment	(179,903)	(169,194)
Deferred income taxes	2,785,196us-gaap_DeferredIncomeTaxExpenseBenefit	1,781,057us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	562,903us-gaap_ShareBasedCompensation	472,356us-gaap_ShareBasedCompensation
Amortization of debt issuance costs	253,803us-gaap_AmortizationOfFinancingCosts	309,236us-gaap_AmortizationOfFinancingCosts
Bad debt expense	96,592us-gaap_ProvisionForDoubtfulAccounts	249,809us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities
Accounts receivable	(3,090,584)	(4,144,333)
Inventories	(75,077)us-gaap_IncreaseDecreaseInInventories	(41,901)us-gaap_IncreaseDecreaseInInventories
Prepaid expense and other current assets	(417,084)	(121,738)
Income taxes receivable	(1,776,035)
Other non-current assets	(423,301)	(175,262)
Accounts payable and accrued expenses	2,359,356	(503,733)
Income taxes payable	(1,278,599)	1,278,599
Net cash provided by operating activities	6,225,338	5,324,900
INVESTING ACTIVITIES
Purchases of property and equipment	(23,955,603)	(5,837,126)
Proceeds from sale and disposal of equipment	370,000	2,053,568
Net cash used in investing activities	(23,585,603)	(3,783,558)
FINANCING ACTIVITIES
Net line of credit borrowings (repayments)	28,634,037us-gaap_ProceedsFromLinesOfCredit	(2,151,052)us-gaap_ProceedsFromLinesOfCredit
Proceeds from issuance of long-term debt		3,720,000
Repayment of long-term debt	(12,619,701)us-gaap_RepaymentsOfLongTermDebt	(2,971,605)us-gaap_RepaymentsOfLongTermDebt
Payment of debt issuance costs	(199,825)us-gaap_PaymentsOfDebtIssuanceCosts	(50,422)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from exercise of warrants	265,298us-gaap_ProceedsFromIssuanceOfWarrants	1,246,300us-gaap_ProceedsFromIssuanceOfWarrants
Proceeds from exercise of stock options	127,987
Excess tax benefits from exercise of options and warrants	238,337
Net cash provided by (used in) financing activities	16,446,133	(206,779)
Net (Decrease) Increase in Cash and Cash Equivalents	(914,132)	1,334,563
Cash and Cash Equivalents, Beginning of Year	1,868,190	533,627
Cash and Cash Equivalents, End of Year	954,058	1,868,190
Supplemental cash flow information:
Cash paid for interest	519,050us-gaap_InterestPaidNet	764,667us-gaap_InterestPaidNet
Cash paid for taxes	2,412,681us-gaap_IncomeTaxesPaid	19,672us-gaap_IncomeTaxesPaid
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Equipment purchased through installment loans		206,523
Cashless exercise of stock options and warrants	$ 7,531	$ 3,656

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

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-Paragraph 14

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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