Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 246,375	$ 218,445
Cost of revenues:
Total cost of revenues	206,022	187,580
Gross margin	40,353	30,865
Selling, general and administrative expenses	40,165	37,107
Depreciation and amortization	1,508	1,297
Loss from operations	(1,320)	(7,539)
Other income (expense):
Investment income, net	1,638	1,769
Interest expense	(34)	(308)
Other, net	32	9
Other income, net	1,636	1,470
Income (loss) before income taxes	316	(6,069)
Provision for (benefit from) income taxes	28	(1,515)
Net income (loss)	$ 288	$ (4,554)
Basic income (loss) per common share	$ 0.04	$ (0.60)
Weighted average number of basic common shares outstanding	7,406	7,576
Diluted income (loss) per common share	$ 0.04	$ (0.60)
Weighted average number of diluted common shares outstanding	7,474	7,576
Professional Employer Service Fees [Member]
Revenues:
Total revenues	$ 217,433	$ 193,819
Staffing Services [Member]
Revenues:
Total revenues	28,942	24,626
Direct Payroll Costs [Member]
Cost of revenues:
Total cost of revenues	21,921	18,450
Payroll Taxes and Benefits [Member]
Cost of revenues:
Total cost of revenues	135,865	122,783
Workers' Compensation [Member]
Cost of revenues:
Total cost of revenues	$ 48,236	$ 46,347