Note 13 - Segment and Geographical Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	$ 196,445	[1],[2]	$ 156,148	[1],[2]	$ 369,473	[1],[2]	$ 304,851	[1],[2]
Segment profit	34,579	[1],[2]	25,006	[1],[2]	62,589	[1],[2]	48,011	[1],[2]
Depreciation and amortization expense	14,858	[1],[2]	15,822	[1],[2]	29,200	[1],[2]	32,148	[1],[2]
Capital expenditures	(2,899)	[1],[2]	1,543	[1],[2]	(3,610)	[1],[2]	(3,313)	[1],[2]
Total assets	949,692	[1],[2],[3]	717,459	[1],[2],[3]	949,692	[1],[2],[3]	717,459	[1],[2],[3]	732,513
Long-lived assets	703,751	[1],[2],[3]	519,854	[1],[2],[3]	703,751	[1],[2],[3]	519,854	[1],[2],[3]
UNITED STATES
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	117,343	[1],[2]	95,493	[1],[2]	223,392	[1],[2]	186,671	[1],[2]
Segment profit	20,629	[1],[2]	12,852	[1],[2]	36,583	[1],[2]	23,771	[1],[2]
Depreciation and amortization expense	8,169	[1],[2]	8,257	[1],[2]	15,888	[1],[2]	16,879	[1],[2]
Capital expenditures	(2,462)	[1],[2]	(710)	[1],[2]	(2,864)	[1],[2]	(1,629)	[1],[2]
Total assets	575,153	[1],[2],[3]	398,012	[1],[2],[3]	575,153	[1],[2],[3]	398,012	[1],[2],[3]
Long-lived assets	486,176	[1],[2],[3]	322,248	[1],[2],[3]	486,176	[1],[2],[3]	322,248	[1],[2],[3]
CANADA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	8,578	[1],[2]	8,275	[1],[2]	16,085	[1],[2]	15,696	[1],[2]
Segment profit	1,165	[1],[2]	1,255	[1],[2]	2,263	[1],[2]	2,540	[1],[2]
Depreciation and amortization expense	711	[1],[2]	2,207	[1],[2]	1,522	[1],[2]	4,244	[1],[2]
Capital expenditures	(8)	[1],[2]	(7)	[1],[2]	(9)	[1],[2]	(18)	[1],[2]
Total assets	28,904	[1],[2],[3]	36,448	[1],[2],[3]	28,904	[1],[2],[3]	36,448	[1],[2],[3]
Long-lived assets	21,411	[1],[2],[3]	28,599	[1],[2],[3]	21,411	[1],[2],[3]	28,599	[1],[2],[3]
UNITED KINGDOM
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	48,665	[1],[2]	35,274	[1],[2]	90,718	[1],[2]	69,041	[1],[2]
Segment profit	8,378	[1],[2]	6,654	[1],[2]	15,459	[1],[2]	13,498	[1],[2]
Depreciation and amortization expense	3,094	[1],[2]	2,843	[1],[2]	6,269	[1],[2]	5,886	[1],[2]
Capital expenditures	(228)	[1],[2]	(265)	[1],[2]	(517)	[1],[2]	(1,001)	[1],[2]
Total assets	244,176	[1],[2],[3]	192,989	[1],[2],[3]	244,176	[1],[2],[3]	192,989	[1],[2],[3]
Long-lived assets	107,338	[1],[2],[3]	91,128	[1],[2],[3]	107,338	[1],[2],[3]	91,128	[1],[2],[3]
AUSTRALIA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	21,859	[1],[2]	17,106	[1],[2]	39,278	[1],[2]	33,443	[1],[2]
Segment profit	4,407	[1],[2]	4,245	[1],[2]	8,284	[1],[2]	8,202	[1],[2]
Depreciation and amortization expense	2,885	[1],[2]	2,515	[1],[2]	5,521	[1],[2]	5,139	[1],[2]
Capital expenditures	(201)	[1],[2]	(561)	[1],[2]	(220)	[1],[2]	(665)	[1],[2]
Total assets	101,459	[1],[2],[3]	90,010	[1],[2],[3]	101,459	[1],[2],[3]	90,010	[1],[2],[3]
Long-lived assets	$ 88,826	[1],[2],[3]	$ 77,879	[1],[2],[3]	$ 88,826	[1],[2],[3]	$ 77,879	[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.