Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 6,164	$ 3,205
Investing activities:
Cash paid for acquisitions, net	(2,299)	(97,153)
Purchases of equipment and leasehold improvements, net	(2,229)	(712)
Working capital and other settlements for acquisitions	(91)	(1,142)
Proceeds from foreign currency net investment hedges	4,812
Cash paid for foreign currency net investment hedges		(3,356)
Other	(1,250)	(839)
Net cash used in investing activities	(1,057)	(103,202)
Financing activities:
Borrowings under senior secured revolving credit facility	25,478	121,012
Proceeds from the exercise of options and warrants	8,855	14,637
Excess tax benefit related to share-based compensation	2,086	6,190
Net borrowings (repayments) under working capital facilities	(132)	4,123
Repayment of contingent earnout obligation	(1,023)
Payment of deferred financing costs		(225)
Repayment of subordinated unsecured notes payable		(333)
Repayment under senior secured revolving credit facility	(29,331)	(50,000)
Net cash provided by (used in) financing activities	5,933	95,404
Exchange rate impact on cash and cash equivalents	(509)	268
Net increase (decrease) in cash and cash equivalents	10,531	(4,325)
Cash and cash equivalents, beginning of period	9,751	12,829
Cash and cash equivalents, end of period	20,282	8,504
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	2,226	1,369
Investing activities:
Cash paid for acquisitions, net	(2,299)	(87,615)
Purchases of equipment and leasehold improvements, net	(1,670)	(402)
Working capital and other settlements for acquisitions	(91)
Proceeds from foreign currency net investment hedges	4,812
Cash paid for foreign currency net investment hedges		(3,356)
Other	(1,250)	(839)
Net cash used in investing activities	(498)	(92,212)
Financing activities:
Repayment of subordinated unsecured notes payable		(333)
Intercompany notes and investments and other	7,088	91,614
Net cash provided by (used in) financing activities	7,088	91,281
Net increase (decrease) in cash and cash equivalents	8,816	438
Cash and cash equivalents, beginning of period	388	760
Cash and cash equivalents, end of period	9,202	1,198
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	3,938	1,836
Investing activities:
Cash paid for acquisitions, net		(9,538)
Purchases of equipment and leasehold improvements, net	(559)	(310)
Working capital and other settlements for acquisitions		(1,142)
Net cash used in investing activities	(559)	(10,990)
Financing activities:
Net borrowings (repayments) under working capital facilities	(132)	4,123
Repayment of contingent earnout obligation	(1,023)
Net cash provided by (used in) financing activities	(1,155)	4,123
Exchange rate impact on cash and cash equivalents	(509)	268
Net increase (decrease) in cash and cash equivalents	1,715	(4,763)
Cash and cash equivalents, beginning of period	9,363	12,069
Cash and cash equivalents, end of period	11,080	7,306
Parent Company [Member]
Financing activities:
Borrowings under senior secured revolving credit facility	25,478	121,012
Proceeds from the exercise of options and warrants	8,855	14,637
Excess tax benefit related to share-based compensation	2,086	6,190
Payment of deferred financing costs		(225)
Repayment under senior secured revolving credit facility	(29,331)	(50,000)
Intercompany notes and investments and other	$ (7,088)	$ (91,614)