Note 5 - Goodwill and Intangible Assets (Details) - Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Amortizable intangible assets:
Net carrying value	$ 125,603	$ 94,864
Gross carrying value	317,098	273,429
Accumulated Amortization	(191,495)	(178,565)
Customer Relationships [Member]
Amortizable intangible assets:
Net carrying value	94,766	69,242
Gross carrying value	236,373	201,395
Accumulated Amortization	(141,607)	(132,153)
Trade Names [Member]
Amortizable intangible assets:
Net carrying value	26,621	23,649
Gross carrying value	65,807	59,813
Accumulated Amortization	(39,186)	(36,164)
Noncompete Agreements [Member]
Amortizable intangible assets:
Estimated useful lives	36 months	36 months
Net carrying value	2,637	1,728
Gross carrying value	5,892	4,714
Accumulated Amortization	(3,255)	(2,986)
Unpatented Technology [Member]
Amortizable intangible assets:
Net carrying value	1,579	245
Gross carrying value	9,026	7,507
Accumulated Amortization	$ (7,447)	$ (7,262)
Minimum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months
Minimum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	45 months	45 months
Minimum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	24 months	24 months
Maximum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	60 months	60 months
Maximum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	84 months	84 months
Maximum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months