Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net service revenues	$ 169,803	$ 137,716	$ 458,749	$ 378,449
Cost of service revenues	123,817	100,926	334,719	277,985
Gross profit	45,986	36,790	124,030	100,464
General and administrative expenses	35,950	28,267	95,429	76,298
Depreciation and amortization	2,756	2,535	7,365	6,676
Total operating expenses	38,706	30,802	102,794	82,974
Operating income from continuing operations	7,280	5,988	21,236	17,490
Interest income	(786)	(113)	(1,096)	(2,468)
Interest expense	866	1,543	2,164	3,836
Total interest expense, net	80	1,430	1,068	1,368
Income from continuing operations before income taxes	7,200	4,558	20,168	16,122
Income tax expense	1,759	927	4,347	3,287
Net income from continuing operations	5,441	3,631	15,821	12,835
Net loss from discontinued operations	(574)		(574)
Net income	$ 4,867	$ 3,631	$ 15,247	$ 12,835
Basic income per share
Continuing operations	$ 0.40	$ 0.29	$ 1.19	$ 1.08
Discontinued operations	(0.04)		(0.04)
Basic income per share	0.36	0.29	1.15	1.08
Diluted income per share
Continuing operations	0.38	0.28	1.16	1.06
Discontinued operations	(0.04)		(0.04)
Diluted income per share	$ 0.34	$ 0.28	$ 1.12	$ 1.06
Weighted average number of common shares and potential common shares outstanding:
Basic	13,766	12,179	13,271	11,740
Diluted	14,203	12,569	13,687	12,037