Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net service revenues	$ 139,254	$ 109,476
Cost of service revenues	101,680	81,543
Gross profit	37,574	27,933
General and administrative expenses	29,257	21,537
Depreciation and amortization	2,074	1,807
Total operating expenses	31,331	23,344
Operating income	6,243	4,589
Interest income	(215)	(2,322)
Interest expense	618	910
Total interest expense (income), net	403	(1,412)
Income before income taxes	5,840	6,001
Income tax expense	978	1,115
Net income	$ 4,862	$ 4,886
Net income per common share
Basic income per share	$ 0.37	$ 0.42
Diluted income per share	$ 0.36	$ 0.42
Weighted average number of common shares and potential common shares outstanding:
Basic	12,995	11,502
Diluted	13,381	11,696