Note 10 - Long-term Debt (Details)									1 Months Ended
		Jun. 30, 2015 USD ($)	Apr. 16, 2015 USD ($)	Feb. 03, 2014	Jun. 28, 2013	Jul. 19, 2011 USD ($)	May. 12, 2011 GBP (£)	Sep. 29, 2010 GBP (£)	Apr. 30, 2015	Dec. 31, 2014 USD ($)	Nov. 02, 2010 USD ($)
Note 10 - Long-term Debt (Details) [Line Items]
Long-term Line of Credit (in Dollars)		$ 0
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)		300,000,000
Default Rate [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				2.00%
Revolving Credit Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											$ 180,000,000
Premex Group [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent							100.00%
UKIM [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £								£ 5,000,000
Long-term Line of Credit (in Dollars)		7,400,000
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)		$ 456,000
Debt Instrument, Term, Increase					24 months
Base Rate		0.50%
Premex Group [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £							£ 26,500,000
Long-term Line of Credit (in Dollars)		$ 34,300,000
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)		$ 7,300,000
Debt Instrument, Term, Increase					24 months
Base Rate		0.50%
Federal Funds Rate Base [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.50%
London Interbank Offered Rate (LIBOR) [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.00%
Base Rate [Member] | UKIM [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.40%			2.50%
Base Rate [Member] | Premex Group [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.40%
Initial Notes [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Issuance Price, Percentage						100.00%
Proceeds from Issuance of Senior Long-term Debt (in Dollars)						$ 250,000,000
Senior Notes 2023 [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Issuance Percentage			100.00%
Proceeds from Issuance of Long-term Debt (in Dollars)			$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage			5.625%
Senior Unsecured Notes Payable [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument Repurchase Percentage of Face Amount						101.00%
Senior Unsecured Notes Payable [Member] | Debt Instrument, Redemption, Period One [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Redemption Period, End Date						Apr. 15, 2018
Debt Instrument, Redemption Price, Percentage						105.625%
Debt Instrument, Redemption Price, Minimum Percent of Original Principal Amount Outstanding After Redemption						60.00%
Senior Unsecured Notes Payable [Member] | Debt Instrument, Redemption, Period Two [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Redemption Period, End Date						Apr. 15, 2018
Debt Instrument, Redemption Price, Percentage						100.00%
Senior Secured Revolving Credit Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Long-term Line of Credit (in Dollars)	[1]									$ 143,853,000
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 300,000,000
Debt Instrument, Term			5 years						5 years
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Right to Increase Revolving Extensions [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 400,000,000
Maximum [Member] | Senior Unsecured Notes Payable [Member] | Debt Instrument, Redemption, Period One [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed						40.00%
Minimum [Member] | UKIM [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Term								36 months
Minimum [Member] | Premex Group [Member]
Note 10 - Long-term Debt (Details) [Line Items]
Debt Instrument, Term							36 months

[1] On November 2, 2010, the Company entered into the Senior Secured Revolving Credit Facility with Bank of America, N.A. The facility initially consisted of a $180.0 million revolving credit facility. The facility is available to finance the Company's acquisition program and working capital needs.On April 16, 2015, the Company amended and restated the terms of its Senior Secured Revolving Credit Facility in connection with the offering of the Notes pursuant to an amended and restated credit agreement (the "Amended and Restated Credit Facility") dated April 16, 2015. The Amended and Restated Credit Facility provides for up to $300.0 million of revolving extensions of credit outstanding at any time (including revolving loans, swingline loans and letters of credit). During the term of the Amended and Restated Credit Facility, the Company has the right, subject to compliance with the covenants specified in the Amended and Restated Credit Facility and the Notes, to increase the revolving extensions under the Amended and Restated Credit Facility to a maximum of $400.0 million. The term of the Senior Secured Revolving Credit Facility was extended for five years from the date of the amendment to April 2020.Borrowings under the Senior Secured Revolving Credit Facility, as amended, bear interest, at either (i) LIBOR plus the applicable margin or (ii) a base rate (equal to the highest of (a) the federal funds rate plus 0.5%, (b) the Bank of America prime rate and (c) LIBOR (using a one-month period) plus 1.0%), plus the applicable margin, as the Company elects. The applicable margin means a percentage per annum determined in accordance with the following table: PricingTier Consolidated SeniorSecured Leverage Ratio CommitmentFee/UnusedLine Fee Letter ofCredit Fee EurocurrencyRate Loans Base RateLoans 1 4.00 to 1.0 0.45% 2.75% 2.75% 1.75%2 3.50 to 1.0 but < 4.00 to 1.0 0.40% 2.50% 2.50% 1.50%3 3.00 to 1.0 but < 3.50 to 1.0 0.35% 2.25% 2.25% 1.25%4 2.50 to 1.0 but < 3.00 to 1.0 0.30% 2.00% 2.00% 1.00%5 < 2.50 to 1.0 0.30% 1.75% 1.75% 0.75%In the event of default, the outstanding indebtedness under the facility will bear interest at an additional 2%.The Senior Secured Revolving Credit Facility contains restrictive covenants, including among other things financial covenants requiring the Company to not exceed a maximum consolidated senior secured leverage coverage ratio, a maximum total consolidated leverage ratio and to maintain a minimum consolidated fixed charge coverage ratio. The Senior Secured Revolving Credit Facility also restricts the Company's ability (subject to certain exceptions) to incur indebtedness, prepay or amend other indebtedness, create liens, make certain fundamental changes including mergers or dissolutions, pay dividends and make other payments in respect of capital stock, make certain investments, sell assets, change its lines of business, enter into transactions with affiliates and other corporate actions.On June 1, 2015 the Company entered into a first amendment to the Senior Secured Revolving Credit Facility ("First Amendment"). The First Amendment amended the definition of "Change of Control" in the Senior Secured Revolving Credit Facility.As of June 30, 2015, the Company had no amount outstanding under the Senior Secured Revolving Credit Facility, resulting in $300.0 million of undrawn commitments.