Note 14 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 17,614	$ 16,222
Investing activities:
Purchases of equipment and leasehold improvements, net	(3,313)	(2,955)
Proceeds from foreign currency net investment hedge	3,810
Working capital and other settlements for acquisitions		1,506
Net cash provided by (used in) investing activities	497	(1,449)
Financing activities:
Borrowings under senior secured revolving credit facility	77,000	11,000
Proceeds from the exercise of options and warrants	6,032	328
Excess tax benefit related to share-based compensation	1,752
Purchases of stock for treasury		(387)
Repayment of subordinated unsecured notes payable		(759)
Payment of deferred financing costs	(52)	(624)
Net repayments of working capital facilities	(3,216)	(4,341)
Repayment under senior secured revolving credit facility	(98,300)	(16,000)
Intercompany investments and other		(95)
Net cash used in financing activities	(16,784)	(10,878)
Exchange rate impact on cash and cash equivalents	(787)	51
Net increase (decrease) in cash and cash equivalents	540	3,946
Cash and cash equivalents, beginning of period	8,627	8,416
Cash and cash equivalents, end of period	9,167	12,362
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	8,832	11,578
Investing activities:
Purchases of equipment and leasehold improvements, net	(1,629)	(2,671)
Proceeds from foreign currency net investment hedge	3,810
Working capital and other settlements for acquisitions		102
Net cash provided by (used in) investing activities	2,181	(2,569)
Financing activities:
Repayment of subordinated unsecured notes payable		(759)
Intercompany investments and other	(13,568)	(5,778)
Net cash used in financing activities	(13,568)	(6,537)
Net increase (decrease) in cash and cash equivalents	(2,555)	2,472
Cash and cash equivalents, beginning of period	4,125	6,044
Cash and cash equivalents, end of period	1,570	8,516
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	8,782	4,644
Investing activities:
Purchases of equipment and leasehold improvements, net	(1,684)	(284)
Working capital and other settlements for acquisitions		1,404
Net cash provided by (used in) investing activities	(1,684)	1,120
Financing activities:
Net repayments of working capital facilities	(3,216)	(4,341)
Net cash used in financing activities	(3,216)	(4,341)
Exchange rate impact on cash and cash equivalents	(787)	51
Net increase (decrease) in cash and cash equivalents	3,095	1,474
Cash and cash equivalents, beginning of period	4,502	2,372
Cash and cash equivalents, end of period	7,597	3,846
Parent Company [Member]
Financing activities:
Borrowings under senior secured revolving credit facility	77,000	11,000
Proceeds from the exercise of options and warrants	6,032	328
Excess tax benefit related to share-based compensation	1,752
Purchases of stock for treasury		(387)
Payment of deferred financing costs	(52)	(624)
Repayment under senior secured revolving credit facility	(98,300)	(16,000)
Intercompany investments and other	$ 13,568	$ 5,683