Note 13 - Segment and Geographical Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
2011
Revenues	$ 616,016	[1],[2]	$ 521,237	[1],[2]	$ 397,860	[1],[2]
Segment profit	97,461	[1],[2]	79,789	[1],[2]	63,304	[1],[2]
Depreciation and amortization expense	62,748	[1],[2]	58,551	[1],[2]	47,439	[1],[2]
Capital expenditures	(6,544)	[1],[2]	(5,841)	[1],[2]	(6,856)	[1],[2]
Total assets	732,513	[1],[2],[3]	740,501	[1],[2],[3]	627,039	[1],[2],[3]
Long-lived assets	512,579	[1],[2],[3]	566,181	[1],[2],[3]	455,784	[1],[2],[3]
UNITED STATES
2011
Revenues	374,817	[1],[2]	340,200	[1],[2]	298,056	[1],[2]
Segment profit	46,934	[1],[2]	44,515	[1],[2]	44,867	[1],[2]
Depreciation and amortization expense	31,787	[1],[2]	34,338	[1],[2]	34,081	[1],[2]
Capital expenditures	(3,197)	[1],[2]	(5,071)	[1],[2]	(6,048)	[1],[2]
Total assets	396,635	[1],[2],[3]	398,163	[1],[2],[3]	402,623	[1],[2],[3]
Long-lived assets	315,748	[1],[2],[3]	337,831	[1],[2],[3]	340,955	[1],[2],[3]
CANADA
2011
Revenues	31,131	[1],[2]	27,595	[1],[2]	21,271	[1],[2]
Segment profit	5,137	[1],[2]	4,942	[1],[2]	5,176	[1],[2]
Depreciation and amortization expense	9,518	[1],[2]	8,381	[1],[2]	4,956	[1],[2]
Capital expenditures	(19)	[1],[2]	(164)	[1],[2]		[1],[2]
Total assets	30,061	[1],[2],[3]	42,223	[1],[2],[3]	50,960	[1],[2],[3]
Long-lived assets	23,056	[1],[2],[3]	34,919	[1],[2],[3]	42,377	[1],[2],[3]
UNITED KINGDOM
2011
Revenues	143,418	[1],[2]	131,278	[1],[2]	78,533	[1],[2]
Segment profit	29,439	[1],[2]	24,810	[1],[2]	13,261	[1],[2]
Depreciation and amortization expense	11,566	[1],[2]	12,341	[1],[2]	8,402	[1],[2]
Capital expenditures	(1,781)	[1],[2]	(564)	[1],[2]	(808)	[1],[2]
Total assets	221,681	[1],[2],[3]	196,365	[1],[2],[3]	173,456	[1],[2],[3]
Long-lived assets	100,796	[1],[2],[3]	99,140	[1],[2],[3]	72,452	[1],[2],[3]
AUSTRALIA
2011
Revenues	66,650	[1],[2]	22,164	[1],[2]		[1],[2]
Segment profit	15,951	[1],[2]	5,522	[1],[2]		[1],[2]
Depreciation and amortization expense	9,877	[1],[2]	3,491	[1],[2]		[1],[2]
Capital expenditures	(1,547)	[1],[2]	(42)	[1],[2]		[1],[2]
Total assets	84,136	[1],[2],[3]	103,750	[1],[2],[3]		[1],[2],[3]
Long-lived assets	$ 72,979	[1],[2],[3]	$ 94,291	[1],[2],[3]		[1],[2],[3]

[1] For segment purposes, the Company defines segment profit as earnings before interest expenses, income taxes, depreciation and amortization, share-based compensation expenses, acquisition related transaction costs and other expenses. A consolidated reconciliation from segment profit to income from operations is included below.

[2] Long-lived assets are noncurrent assets excluding deferred tax assets and deferred financing costs.

[3] Total assets and long-lived assets include goodwill. Goodwill recorded in connection with certain tax benefits to be realized in the Company's U.S. income tax returns has been reflected in the United States segment.