Note 13 - Segment and Geographical Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	$ 204,078	[1],[2]	$ 152,354	[1],[2]	$ 573,551	[1],[2]	$ 457,205	[1],[2]
Segment profit	36,083	[1],[2]	23,885	[1],[2]	98,672	[1],[2]	71,896	[1],[2]
Depreciation and amortization expense	15,705	[1],[2]	15,910	[1],[2]	44,905	[1],[2]	48,058	[1],[2]
Capital expenditures	(2,582)	[1],[2]	(1,445)	[1],[2]	(6,192)	[1],[2]	(4,758)	[1],[2]
Total assets	940,017	[1],[2],[3]	725,154	[1],[2],[3]	940,017	[1],[2],[3]	725,154	[1],[2],[3]	732,513
Long-lived assets	686,702	[1],[2],[3]	521,352	[1],[2],[3]	686,702	[1],[2],[3]	521,352	[1],[2],[3]
UNITED STATES
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	123,112	[1],[2]	93,963	[1],[2]	346,504	[1],[2]	280,634	[1],[2]
Segment profit	21,187	[1],[2]	12,023	[1],[2]	57,770	[1],[2]	35,794	[1],[2]
Depreciation and amortization expense	9,148	[1],[2]	7,730	[1],[2]	25,037	[1],[2]	24,608	[1],[2]
Capital expenditures	(1,305)	[1],[2]	(540)	[1],[2]	(4,169)	[1],[2]	(2,170)	[1],[2]
Total assets	578,158	[1],[2],[3]	396,503	[1],[2],[3]	578,158	[1],[2],[3]	396,503	[1],[2],[3]
Long-lived assets	482,513	[1],[2],[3]	321,351	[1],[2],[3]	482,513	[1],[2],[3]	321,351	[1],[2],[3]
CANADA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	8,075	[1],[2]	7,290	[1],[2]	24,160	[1],[2]	22,986	[1],[2]
Segment profit	842	[1],[2]	1,238	[1],[2]	3,105	[1],[2]	3,778	[1],[2]
Depreciation and amortization expense	685	[1],[2]	3,087	[1],[2]	2,207	[1],[2]	7,331	[1],[2]
Capital expenditures	(3)	[1],[2]		[1],[2]	(12)	[1],[2]	(18)	[1],[2]
Total assets	27,195	[1],[2],[3]	33,835	[1],[2],[3]	27,195	[1],[2],[3]	33,835	[1],[2],[3]
Long-lived assets	19,522	[1],[2],[3]	26,242	[1],[2],[3]	19,522	[1],[2],[3]	26,242	[1],[2],[3]
UNITED KINGDOM
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	48,865	[1],[2]	34,604	[1],[2]	139,583	[1],[2]	103,645	[1],[2]
Segment profit	8,154	[1],[2]	6,997	[1],[2]	23,613	[1],[2]	20,495	[1],[2]
Depreciation and amortization expense	2,962	[1],[2]	2,751	[1],[2]	9,230	[1],[2]	8,637	[1],[2]
Capital expenditures	(505)	[1],[2]	(250)	[1],[2]	(1,022)	[1],[2]	(1,250)	[1],[2]
Total assets	239,533	[1],[2],[3]	207,464	[1],[2],[3]	239,533	[1],[2],[3]	207,464	[1],[2],[3]
Long-lived assets	103,945	[1],[2],[3]	95,344	[1],[2],[3]	103,945	[1],[2],[3]	95,344	[1],[2],[3]
AUSTRALIA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	24,026	[1],[2]	16,497	[1],[2]	63,304	[1],[2]	49,940	[1],[2]
Segment profit	5,900	[1],[2]	3,627	[1],[2]	14,184	[1],[2]	11,829	[1],[2]
Depreciation and amortization expense	2,910	[1],[2]	2,342	[1],[2]	8,431	[1],[2]	7,482	[1],[2]
Capital expenditures	(769)	[1],[2]	(655)	[1],[2]	(989)	[1],[2]	(1,320)	[1],[2]
Total assets	95,131	[1],[2],[3]	87,352	[1],[2],[3]	95,131	[1],[2],[3]	87,352	[1],[2],[3]
Long-lived assets	$ 80,722	[1],[2],[3]	$ 78,415	[1],[2],[3]	$ 80,722	[1],[2],[3]	$ 78,415	[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.