Note 3 - Acquisitions (Details) - Preliminary Allocation (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Goodwill	$ 368,825,000	$ 370,143,000	$ 300,260,000
Totals	350,000	109,500,000
Preliminary Purchase Price Allocation [Member] | Customer Relationships [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Intangible assets	44,413,000	44,413,000
Preliminary Purchase Price Allocation [Member] | Trade Names [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Intangible assets	11,901,000	11,901,000
Preliminary Purchase Price Allocation [Member] | Noncompete Agreements [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Intangible assets	313,000	313,000
Preliminary Purchase Price Allocation [Member] | Unpatented Technology [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Intangible assets	666,000	666,000
Preliminary Purchase Price Allocation [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Equipment and leasehold improvements	850,000	850,000
Goodwill	66,002,000	60,373,000
Net deferred tax liability associated with step-up in book basis	(15,446,000)	(9,610,000)
Assets acquired and liabilities assumed, net	826,000	269,000
Totals	109,525,000	109,175,000
Purchase Price Adjustments and Reclassifications [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation [Line Items]
Goodwill	5,629,000
Net deferred tax liability associated with step-up in book basis	(5,836,000)
Assets acquired and liabilities assumed, net	557,000
Totals	$ 350,000