Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 262,611	$ 3,327,777
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	(69,371)	1,992,197
Noncash stock compensation expense	5,316,837	1,891,067
Noncash interest expense	1,862,661	0
Change in contingent consideration due to seller	(152,382)	(95,934)
Depreciation and amortization	7,529,333	3,873,137
Change in assets, net of acquisitions:
Accounts receivable	(12,570,057)	(5,395,359)
Taxes receivable	(497,228)	(2,500,965)
Prepaid expenses and other assets	413,201	648,217
Change in liabilities, net of acquisitions:
Accounts payable	12,417,253	12,365,149
Accrued expenses and other liabilities	(162,880)	(6,676,417)
Net cash provided by operating activities	14,349,978	9,428,869
Investing activities
Purchases of property and equipment	(4,311,663)	(2,790,885)
Payments for acquisitions, net of cash acquired	0	(5,869,303)
Net cash used in investing activities	(4,311,663)	(8,660,188)
Financing activities
Tax benefit of stock options exercised	283,698	1,121,270
Payment of contingent consideration	(2,086,243)	(2,665,833)
Proceeds from exercise of stock options	34,188	773,168
Employee tax withholdings related to net share settlements of equity-based awards	(1,882,672)	(1,576,316)
Purchases of treasury stock	(19,390,803)	0
Proceeds from borrowing on line of credit	0	29,782,500
Repayments of amounts borrowed on line of credit	0	(29,782,500)
Proceeds from borrowing on ABL facility	6,000,000	0
Repayments of amounts borrowed on ABL facility	(6,000,000)	0
Payment to former owners of One Stop Logistics	0	(13,782,500)
Net cash used in financing activities	(23,041,832)	(16,130,211)
Decrease in cash and cash equivalents	(13,003,517)	(15,361,530)
Cash and cash equivalents, beginning of period	56,522,194	32,542,119
Cash and cash equivalents, end of period	43,518,677	17,180,589
Supplemental disclosure of cash flow information
Cash paid during the period for interest	0	37,968
Cash paid during the period for income taxes	436,900	1,324,828
Noncash financing activity
Due to seller	$ 0	$ 1,500,000