Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price 2011 (USD $)	12 Months Ended											12 Months Ended		12 Months Ended	1 Months Ended									12 Months Ended		12 Months Ended	0 Months Ended									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2011 MES Group [Member] Customer Relationships [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 MES Group [Member] Customer Relationships [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 MES Group [Member] Trade Names [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 MES Group [Member] Trade Names [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 MES Group [Member] Noncompete Agreements [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 MES Group [Member] Noncompete Agreements [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 MES Group [Member] Unpatented Technology [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 MES Group [Member] Unpatented Technology [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 MES Group [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2011 MES Group [Member] Purchase Price Adjustments and Reclassifications [Member]	Dec. 31, 2012 MES Group [Member] Final Purchase Price Allocation [Member]	Feb. 28, 2011 MES Group [Member]	Dec. 31, 2011 Premex Group [Member] Customer Relationships [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Premex Group [Member] Customer Relationships [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Premex Group [Member] Trade Names [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Premex Group [Member] Trade Names [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Premex Group [Member] Noncompete Agreements [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Premex Group [Member] Noncompete Agreements [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Premex Group [Member] Unpatented Technology [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Premex Group [Member] Unpatented Technology [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Premex Group [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2011 Premex Group [Member] Purchase Price Adjustments and Reclassifications [Member]	Dec. 31, 2012 Premex Group [Member] Final Purchase Price Allocation [Member]	May 10, 2011 Premex Group [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Customer Relationships [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member] Customer Relationships [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Trade Names [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member] Trade Names [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Noncompete Agreements [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member] Noncompete Agreements [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Unpatented Technology [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member] Unpatented Technology [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Preliminary Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member] Purchase Price Adjustments and Reclassifications [Member]	Dec. 31, 2012 Other 2011 Acquisitions [Member] Final Purchase Price Allocation [Member]	Dec. 31, 2011 Other 2011 Acquisitions [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price 2011 [Line Items]
Building, equipment and leasehold improvements												$ 1,800,000		$ 1,800,000										$ 650,000		$ 650,000										$ 213,000		$ 213,000
Intangible Assets				38,190,000	38,190,000	17,426,000	17,426,000	511,000	511,000	762,000	762,000					32,886,000	32,886,000	10,602,000	10,602,000	109,000	109,000	2,356,000	2,356,000					18,577,000	18,577,000	2,989,000	2,989,000	197,000	197,000	334,000	334,000
Goodwill	370,143,000	369,312,000	300,260,000									159,988,000	2,048,000	162,036,000										28,131,000	3,686,000	31,817,000										21,500,000	(1,653,000)	19,847,000
Net deferred tax liability associated with step-up in book basis												(18,244,000)	693,000	(17,551,000)										603,000	(3,695,000)	(3,092,000)										(356,000)	50,000	(306,000)
Assets acquired and liabilities assumed, net												14,581,000	(2,741,000)	11,840,000										33,019,000	9,000	33,028,000										2,598,000	104,000	2,702,000
Totals	$ 109,500,000											$ 215,014,000		$ 215,014,000	$ 215,000,000									$ 108,356,000		$ 108,356,000	$ 108,400,000									$ 46,052,000	$ (1,499,000)	$ 44,553,000	$ 43,200,000