Note 13 - Segment and Geographical Information (Details) - Segment Information (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	$ 196,316		$ 173,028
Segment profit	31,952		28,010
Depreciation and amortization expense	14,848		14,342
Capital expenditures	(2,229)		(712)
Total assets	943,762	[1]	847,625	[1]	930,144
Long-lived assets	647,583	[1]	618,752	[1]
UNITED STATES
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	121,718		106,049
Segment profit	19,522		15,954
Depreciation and amortization expense	9,411		7,720
Capital expenditures	(1,670)		(402)
Total assets	602,005	[1]	488,362	[1]
Long-lived assets	471,040	[1]	403,354	[1]
CANADA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	7,949		7,507
Segment profit	634		1,098
Depreciation and amortization expense	582		811
Capital expenditures	(114)
Total assets	22,343	[1]	28,293	[1]
Long-lived assets	15,613	[1]	21,169	[1]
UNITED KINGDOM
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	47,444		42,053
Segment profit	7,699		7,081
Depreciation and amortization expense	2,383		3,175
Capital expenditures	(189)		(290)
Total assets	236,186	[1]	230,597	[1]
Long-lived assets	92,703	[1]	105,373	[1]
AUSTRALIA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues	19,205		17,419
Segment profit	4,097		3,877
Depreciation and amortization expense	2,472		2,636
Capital expenditures	(256)		(20)
Total assets	83,228	[1]	100,373	[1]
Long-lived assets	$ 68,227	[1]	$ 88,856	[1]

[1] 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.