CREDIT AGREEMENTS CREDIT AGREEMENTS (Details) € in Thousands, £ in Thousands, SGD in Thousands, NZD in Thousands, AUD in Thousands, $ in Thousands		9 Months Ended	12 Months Ended
	Sep. 15, 2016 USD ($)	Sep. 30, 2018	Dec. 31, 2017 USD ($) Rate	Dec. 31, 2017 AUD Rate	Dec. 31, 2017 SGD Rate	Dec. 31, 2017 GBP (£) Rate	Dec. 31, 2017 NZD Rate	Dec. 31, 2017 EUR (€) Rate	Sep. 15, 2017 USD ($)	Sep. 15, 2017 GBP (£)	Sep. 15, 2016 GBP (£)	Aug. 01, 2014 USD ($)	Aug. 01, 2014 GBP (£)
Line of Credit Facility [Line Items]
Line of credit facility, average outstanding amount			$ 11,249
Debt, weighted average interest rate			3.07%	3.07%	3.07%	3.07%	3.07%	3.07%
Overdraft Facility [Member] | Singapore Subsidiary [Member] | Singapore Prime Rate
Line of Credit Facility [Line Items]
Debt instrument, interest rate increase			1.75%
Lloyds [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 16,216										£ 12,000	$ 20,270	£ 15,000
Initial Term (in Years) of the Credit Agreement			2
Renewal Term (in months) after the initial term of the Lloyds Agreement			3
Debt instrument, interest rate increase	1.75%
Percentage of true credit note dilution limit			5.00%
Debt Turns in days			55
Debt Turn rolling period in months			3
Line of Credit Facility, Covenant, Minimum Availability Required			$ 2,703			£ 2,000
Lloyds [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity			7,581
Line of credit facility, minimum excess availability			$ 5,609
Interest rates on outstanding borrowing			2.25%	2.25%	2.25%	2.25%	2.25%	2.25%
Line of Credit Facility, Fair Value of Amount Outstanding			$ (1,972)
Lloyds [Member] | Credit Facility Lending based on Billed Revenue [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,540										11,500
Percentage of eligible Temp receivable	83.00%
Lloyds [Member] | Credit Facility Lending based on Unbilled Revenue [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 676										£ 500
Percentage of eligible Permanent receivable	25.00%
Lloyds Bank PLC [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 13,513	£ 10,000
Line Of Credit Facility, Minimum Month-End Excess Availability									2,027	1,500
Lloyds Bank PLC [Member] | Credit Facility Lending based on Billed Revenue [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 12,837	£ 9,500
National Australia Bank Limited and Bank of New Zealand [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenants, Minimum Fixed Charges Coverage Ratio Required | Rate			150.00%	150.00%	150.00%	150.00%	150.00%	150.00%
Line of Credit Facility, Covenants, Minimum Receivables Ratio | Rate			120.00%	120.00%	120.00%	120.00%	120.00%	120.00%
National Australia Bank Limited and Bank of New Zealand [Member] | Financial Guarantee Facility [Member]
Line of Credit Facility [Line Items]
Financial guarantee capacity			$ 2,343	AUD 3,000
Debt Instrument, Fee Percent			1.50%
Less: outstanding financial guarantee requested			$ (2,046)
Additional availability for financial guarantee			$ 297
Interest rates on financial guarantee requested			1.50%	1.50%	1.50%	1.50%	1.50%	1.50%
National Australia Bank Limited and Bank of New Zealand [Member] | Australian Receivables Facility [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 3,124	AUD 4,000
National Australia Bank Limited and Bank of New Zealand [Member] | Australian Receivables Facility [Member] [Domain] | Australia
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 19,523	AUD 25,000
Debt instrument, interest rate increase			1.50%
Borrowing capacity			$ 17,968
Line of credit facility, minimum excess availability			$ 12,860
Interest rates on outstanding borrowing			3.50%	3.50%	3.50%	3.50%	3.50%	3.50%
Debt Instrument, Fee Amount			$ 5	AUD 6
Line of Credit Facility, Fair Value of Amount Outstanding			(5,108)
National Australia Bank Limited and Bank of New Zealand [Member] | New Zealand Receivables Agreement [Member] | New Zealand Subsidiary
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			3,547				NZD 5,000
Borrowing capacity			2,289
Line of credit facility, minimum excess availability			$ 2,289
Interest rates on outstanding borrowing			3.99%	3.99%	3.99%	3.99%	3.99%	3.99%
Debt Instrument, Fee Amount			$ 1				NZD 1
LIne of Credit Facility, Notice Period			90 days
Long-term Line of Credit			$ 0
National Australia Bank Limited [Member] | Financial Guarantee Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Fee Percent			0.30%
Lending Arrangements Belgium, Netherlands and Singapore Banks | Overdraft Facility [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit			$ 0
Lending Arrangements Belgium Bank | Overdraft Facility [Member] | Belgium Subsidiary
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,200					€ 1,000
LIne of Credit Facility, Notice Period			15 days
Lending Arrangements Netherlands and Belgium Banks | Overdraft Facility [Member] | EURIBOR
Line of Credit Facility [Line Items]
Interest rates on outstanding borrowing			2.75%	2.75%	2.75%	2.75%	2.75%	2.75%
Lending Arrangements Singapore Bank | Singapore Subsidiary [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 150		SGD 200
Lending arrangement expiration		1 year
Lending Arrangements Singapore Bank | Singapore Subsidiary [Member]
Line of Credit Facility [Line Items]
Line of credit facility, minimum excess availability			$ 150		SGD 200
Lending Arrangements Singapore Bank | Overdraft Facility [Member] | Singapore Subsidiary [Member] | Singapore Prime Rate
Line of Credit Facility [Line Items]
Interest rates on outstanding borrowing			6.00%	6.00%	6.00%	6.00%	6.00%	6.00%