Note 10 - Long-Term Debt (Detail)	0 Months Ended		1 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended		48 Months Ended								3 Months Ended		3 Months Ended
	Jul. 19, 2011 USD ($)	May 06, 2011 USD ($)	Feb. 27, 2012	Jul. 31, 2011 USD ($)	Jun. 30, 2012 USD ($)		Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)		Jul. 15, 2015	Mar. 31, 2012 USD ($)	Jan. 15, 2012	Jul. 07, 2011 USD ($)	Feb. 09, 2011 USD ($)	Dec. 31, 2010 USD ($)	Nov. 02, 2010 USD ($)	Dec. 31, 2010 Minimum [Member] Noninterest Bearing [Member] USD ($)	Sep. 30, 2011 Minimum [Member] USD ($)	Dec. 31, 2010 Maximum [Member] Noninterest Bearing [Member] USD ($)	Sep. 30, 2011 Maximum [Member] USD ($)	Dec. 31, 2011 UKIM [Member] USD ($)	Sep. 29, 2010 UKIM [Member] GBP (£)	Dec. 31, 2011 Premex Group [Member] USD ($)	May 12, 2011 Premex Group [Member] GBP (£)	Jul. 07, 2011 Federal Funds Rate Base [Member]	Jul. 07, 2011 LIBOR Rate Base [Member]	Jul. 07, 2011 Default Rate [Member]	Dec. 31, 2010 Subordinated Unsecured Notes [Member] USD ($)	Dec. 31, 2010 Noninterest Bearing [Member] USD ($)
Senior Notes	$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	9.00%			9.00%				9.00%				9.00%															2.00%	6.00%
Proceeds from Issuance of Senior Long-term Debt	250,000,000
Debt Instrument, Call Feature										At any time on or after July 15, 2015, the Company may redeem some or all of the Senior Unsecured Notes at the redemption prices stated in the Indenture, plus accrued and unpaid interest to the date of redemption.Prior to July 15, 2014, the Company may redeem up to 35% of the aggregate principal amount of the Senior Unsecured Notes with net cash proceeds from certain equity offerings at a redemption price equal to 109% of the aggregate principal amount of the Senior Unsecured Notes, plus accrued and unpaid interest, if any, provided that at least 65% of the original aggregate principal amount of the Senior Unsecured Notes remains outstanding after redemption.Further, the Company may redeem some or all of the of the Senior Unsecured Notes at any time prior to July 15, 2015 at a redemption price equal to 100% of the principal amount of the Senior Unsecured Notes plus a make whole premium described in the Indenture, plus accrued and unpaid interest.
Debt Instrument Repurchase Percentage of Face Amount										101.00%
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000		262,500,000									262,500,000	245,000,000		180,000,000						5,000,000		26,500,000
Line of Credit Facility, Increase (Decrease), Other, Net		55,000,000		(37,500,000)
Line of Credit Facility, Covenant Terms			1.00		36			The Second Amendment amended the Senior Secured Revolving Credit Facility to, among other things, (i) extend the maturity date of the Senior Secured Revolving Credit Facility from November 2013 to July 2016; (ii) permit the issuance and sale of the Senior Unsecured Notes; (iii) replace the consolidated senior leverage ratio with a consolidated senior secured leverage ratio while permitting the maximum consolidated senior secured leverage ratio to be 3.00 to 1; (iv) permit the Company's maximum consolidated leverage ratio to increase from 3.5 to 1 to 4.75 to 1; (v) reduce the borrowing cost; and (vi) allow the Company to complete acquisitions with a purchase price of up to $75.0 million (previously $50.0 million) without prior lender consent. The Second Amendmentalsoreduced the aggregate revolving commitmentsunder the Senior Secured Revolving Credit Facilityby $37.5 million for a maximum commitment of $262.5 million, subject to the Company's right to increase the aggregate revolving commitments by $37.5 millionfor a maximum commitment of $300.0 million,so long as the Company is not in default and the Company satisfies certain other customary conditions.
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		50,000,000											75,000,000
Line Of Credit Facility Increase Right								37,500,000
Line Of Credit Facility Increase Capacity													300,000,000
Debt Instrument, Basis Spread on Variable Rate																						2.50%		2.40%	0.50%	1.00%
Line of Credit Facility, Amount Outstanding											262,500,000										6,100,000		29,100,000
Letters of Credit Outstanding, Amount					83,000			190,000			83,000
Debt Instrument, Interest Rate at Period End																					0.50%		0.50%
Line of Credit Facility, Remaining Borrowing Capacity																					1,700,000		12,300,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred															6,900,000
Notes Payable					1,960,000	[1]		2,649,000	[1]																			4,400,000	2,500,000
Debt Instrument, Periodic Payment																		50,000		76,000
Debt Instrument, Annual Principal Payment																	250,000		750,000
Repayments of Long-term Debt							$ 734,000

[1] During 2009 and 2010, the Company issued seller debt in the form of subordinated unsecured notes payable with an estimated fair value of approximately $6.9 million relating to certain acquisitions. These notes are unsecured and subordinated to the Senior Secured Revolving Credit Facility and the Senior Unsecured Notes issued in July 2011. Five notes payable totaling $4.4 million bear interest at 6.0%, and are payable quarterly with amounts ranging between $50,000 and $76,000, with maturity dates through March 2013. The remaining balance of the notes payable, $2.5 million, are noninterest bearing and are payable annually with amounts ranging between $250,000 and $750,000, maturing through 2014. The Company made principal payments totaling $734,000 during the six months ended June 30, 2012.