Note 13 - Segment and Geographical Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
2012
Revenues	$ 775,615	[1],[2]	$ 616,016	[1],[2]	$ 521,237	[1],[2]
Segment profit	132,140	[1],[2]	97,461	[1],[2]	79,789	[1],[2]
Depreciation and amortization expense	60,280	[1],[2]	62,748	[1],[2]	58,551	[1],[2]
Capital expenditures	(10,894)	[1],[2]	(6,544)	[1],[2]	(5,841)	[1],[2]
Total assets	930,144	[1],[2],[3]	732,513	[1],[2],[3]	740,501	[1],[2],[3]
Long-lived assets	662,334	[1],[2],[3]	512,579	[1],[2],[3]	566,181	[1],[2],[3]
UNITED STATES
2012
Revenues	468,419	[1],[2]	374,817	[1],[2]	340,200	[1],[2]
Segment profit	76,065	[1],[2]	46,934	[1],[2]	44,515	[1],[2]
Depreciation and amortization expense	34,302	[1],[2]	31,787	[1],[2]	34,338	[1],[2]
Capital expenditures	(7,687)	[1],[2]	(3,197)	[1],[2]	(5,071)	[1],[2]
Total assets	577,974	[1],[2],[3]	396,635	[1],[2],[3]	398,163	[1],[2],[3]
Long-lived assets	473,800	[1],[2],[3]	315,748	[1],[2],[3]	337,831	[1],[2],[3]
CANADA
2012
Revenues	32,889	[1],[2]	31,131	[1],[2]	27,595	[1],[2]
Segment profit	4,673	[1],[2]	5,137	[1],[2]	4,942	[1],[2]
Depreciation and amortization expense	2,824	[1],[2]	9,518	[1],[2]	8,381	[1],[2]
Capital expenditures	(37)	[1],[2]	(19)	[1],[2]	(164)	[1],[2]
Total assets	25,807	[1],[2],[3]	30,061	[1],[2],[3]	42,223	[1],[2],[3]
Long-lived assets	18,178	[1],[2],[3]	23,056	[1],[2],[3]	34,919	[1],[2],[3]
UNITED KINGDOM
2012
Revenues	189,755	[1],[2]	143,418	[1],[2]	131,278	[1],[2]
Segment profit	32,921	[1],[2]	29,439	[1],[2]	24,810	[1],[2]
Depreciation and amortization expense	12,048	[1],[2]	11,566	[1],[2]	12,341	[1],[2]
Capital expenditures	(1,254)	[1],[2]	(1,781)	[1],[2]	(564)	[1],[2]
Total assets	239,260	[1],[2],[3]	221,681	[1],[2],[3]	196,365	[1],[2],[3]
Long-lived assets	96,635	[1],[2],[3]	100,796	[1],[2],[3]	99,140	[1],[2],[3]
AUSTRALIA
2012
Revenues	84,552	[1],[2]	66,650	[1],[2]	22,164	[1],[2]
Segment profit	18,481	[1],[2]	15,951	[1],[2]	5,522	[1],[2]
Depreciation and amortization expense	11,106	[1],[2]	9,877	[1],[2]	3,491	[1],[2]
Capital expenditures	(1,916)	[1],[2]	(1,547)	[1],[2]	(42)	[1],[2]
Total assets	87,103	[1],[2],[3]	84,136	[1],[2],[3]	103,750	[1],[2],[3]
Long-lived assets	$ 73,721	[1],[2],[3]	$ 72,979	[1],[2],[3]	$ 94,291	[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.