CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interest	Total
Beginning balance (deficit) at Dec. 31, 2011	$ 15	$ 92,662	$ (318)	$ (51,108)	$ (85)	$ 41,166
Beginning balance at Dec. 31, 2011	15,464,864
Increase (Decrease) in Stockholders' Equity
Net income				1,340	1,034	2,374
Foreign currency translation adjustments			2			2
Cash flow hedge			(65)			(65)
Shares issued-Central Merger	7	140,719				140,726
Shares issued-Central Merger (in shares)	6,161,332
Exercise of stock options		526				526
Exercise of stock options (in shares)	81,023
Issuance of stock grants		165				165
Issuance of stock grants (in shares)	8,751
Vested restricted stock units (in shares)	154,800
Non-cash stock-based compensation related to restricted stock units		1,857				1,857
Tax benefit from exercise of stock options and vesting of restricted stock units		446				446
Purchase of Central shares of noncontrolling interest					677	677
Distribution to noncontrolling interest					(874)	(874)
Ending balance (deficit) at Dec. 31, 2012	22	236,375	(381)	(49,768)	752	187,000
Ending balance at Dec. 31, 2012	21,870,770
Increase (Decrease) in Stockholders' Equity
Net income				12,089	2,676	14,765
Foreign currency translation adjustments			(463)			(463)
Cash flow hedge			962			962
Issuance of stock grants (in shares)	15,576
Vested restricted stock units (in shares)	90,965
Non-cash stock-based compensation related to restricted stock units		4,092				4,092
Tax benefit from exercise of stock options and vesting of restricted stock units		198				198
Distribution to noncontrolling interest					(2,843)	(2,843)
Ending balance (deficit) at Dec. 31, 2013	22	240,665	118	(37,679)	585	203,711
Ending balance at Dec. 31, 2013	21,977,311					21,977,311
Increase (Decrease) in Stockholders' Equity
Net income				23,098	3,035	26,133
Foreign currency translation adjustments			(162)			(162)
Cash flow hedge			(161)			(161)
Issuance of stock grants		492				492
Issuance of stock grants (in shares)	19,336
Vested restricted stock units (in shares)	131,078
Non-cash stock-based compensation related to restricted stock units		2,775				2,775
Tax benefit from exercise of stock options and vesting of restricted stock units		(65)				(65)
Distribution to noncontrolling interest					(2,911)	(2,911)
Ending balance (deficit) at Dec. 31, 2014	$ 22	$ 243,867	$ (205)	$ (14,581)	$ 709	$ 229,812
Ending balance at Dec. 31, 2014	22,127,725					22,127,725