Note 3 - Acquisitions (Details) - Preliminary Allocation (USD $) In Thousands, unless otherwise specified	12 Months Ended											6 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2011	Jun. 30, 2013 Preliminary Purchase Price Allocation [Member] Customer Relationships [Member]	Dec. 31, 2012 Preliminary Purchase Price Allocation [Member] Customer Relationships [Member]	Jun. 30, 2013 Preliminary Purchase Price Allocation [Member] Trade Names [Member]	Dec. 31, 2012 Preliminary Purchase Price Allocation [Member] Trade Names [Member]	Jun. 30, 2013 Preliminary Purchase Price Allocation [Member] Noncompete Agreements [Member]	Dec. 31, 2012 Preliminary Purchase Price Allocation [Member] Noncompete Agreements [Member]	Jun. 30, 2013 Preliminary Purchase Price Allocation [Member] Unpatented Technology [Member]	Dec. 31, 2012 Preliminary Purchase Price Allocation [Member] Unpatented Technology [Member]	Jun. 30, 2013 Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Preliminary Purchase Price Allocation [Member]	Jun. 30, 2013 Purchase Price Adjustments and Reclassifications [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Equipment and leasehold improvements												$ 850	$ 850
Intangible assets				44,413	44,413	11,901	11,901	313	313	666	666
Goodwill	370,143	359,611	300,260									59,887	60,373	(486)
Net deferred tax liability associated with step-up in book basis												(9,610)	(9,610)
Assets acquired and liabilities assumed, net												755	269	486
Totals	$ 109,200											$ 109,175	$ 109,175