Note 10 - Long-term Debt (Details Textual)										1 Months Ended	3 Months Ended		12 Months Ended
		Apr. 16, 2015 USD ($)	Feb. 03, 2014 USD ($)	Jun. 28, 2013	Jul. 19, 2011 USD ($)	Jul. 07, 2011 USD ($)	May. 12, 2011 GBP (£)	May. 06, 2011 USD ($)	Sep. 29, 2010 GBP (£)	Feb. 27, 2012	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Aug. 27, 2012 USD ($)	Dec. 31, 2011 USD ($)	May. 05, 2011 USD ($)	Nov. 02, 2010 USD ($)
Senior Unsecured Notes [Member]
Payments of Debt Extinguishment Costs											$ 0	$ 0	$ 7,500,000
Proceeds from Issuance of Senior Long-term Debt					$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage					9.00%
Debt Instrument, Term											8 years
Amortization of Debt Issuance Costs												226,000
Senior Notes 2023 [Member]
Debt Instrument, Issuance Price Percentage		100.00%
Debt Instrument, Interest Rate, Stated Percentage											5.625%
Senior Unsecured Notes Payable [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed					40.00%
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]
Debt Instrument, Redemption Price, Percentage					100.00%
Senior Unsecured Notes Payable [Member]
Debt Instrument Repurchase Percentage of Face Amount					101.00%
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Right to Increase Revolving Extensions [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000,000
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument, Term		5 years									5 years
Amortization of Debt Issuance Costs											$ 148,000	361,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 300,000,000
Senior Secured Revolving Credit Facility [Member]
Long-term Line of Credit	[1]										$ 50,000,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																	$ 180,000,000
Original Maximum Consolidated Leverage Ratio [Member]
Consolidated Leverage Ratio						3.5
New Maximum Consolidated Leverage Ratio [Member]
Consolidated Leverage Ratio						4.75
Any Fiscal Quarter After September 30, 2012 [Member]
Minimum Fixed Charge Coverage Ratio										2
With Negative Trailing Twelve Months Adjusted EBITDA [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 3
Without Delivering Pro Forma Projections to the Lenders [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 75,000,000
Default Rate [Member]
Debt Instrument, Interest Rate, Stated Percentage			2.00%
Federal Funds Rate Base [Member]
Debt Instrument, Basis Spread on Variable Rate			0.50%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			1.00%
Base Rate [Member] | UKIM [Member]
Debt Instrument, Basis Spread on Variable Rate		2.05%		2.40%					2.50%		0.50%
Base Rate [Member] | Premex Group [Member]
Debt Instrument, Basis Spread on Variable Rate		2.05%					2.40%				0.50%
UKIM [Member] | Minimum [Member]
Debt Instrument, Term									3 years
UKIM [Member]
Line of Credit Facility, Maximum Borrowing Capacity | £									£ 5,000,000
Long-term Line of Credit											$ 6,000,000
Line of Credit Facility, Remaining Borrowing Capacity											1,200,000
Debt Instrument, Term, Increase				2 years
Premex Group [Member] | Minimum [Member]
Debt Instrument, Term							3 years
Premex Group [Member]
Line of Credit Facility, Maximum Borrowing Capacity | £							£ 26,500,000
Long-term Line of Credit											26,600,000
Line of Credit Facility, Remaining Borrowing Capacity											11,500,000
Debt Instrument, Term, Increase				2 years
Amortization of Debt Issuance Costs											381,000	$ 587,000
Line of Credit Facility, Maximum Borrowing Capacity			$ 5,000,000			$ 262,500,000		$ 300,000,000								$ 245,000,000
Line of Credit Facility, Increase (Decrease), Other, Net								55,000,000
Consolidated Senior Secured Leverage Ratio						3
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases						$ 75,000,000		$ 50,000,000
Line of Credit Facility Increase Right						37,500,000
Line of Credit Facility Increase, Capacity						$ 300,000,000
Minimum Fixed Charge Coverage Ratio										1.75
Secured Revolving Credit Facility, Alternative Currency Sublimit														$ 100,000,000	$ 60,000,000
Long-term Line of Credit											50,000,000
Line of Credit Facility, Remaining Borrowing Capacity											$ 250,000,000

[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. On May 6, 2011, the Company increased and fully exercised the accordion features of the Senior Secured Revolving Credit Facility. The increase and exercise of the accordion feature increased the committed capacity of the credit facility by $55.0 million, from a total of $245.0 million to a total of $300.0 million. On July 7, 2011, the Company entered into a second amendment to its Senior Secured Revolving Credit Facility (the "Second Amendment") which became effective simultaneously with the consummation of the Company's private offering of the Senior Unsecured Notes. 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 Amendment also reduced the aggregate revolving commitments under the Senior Secured Revolving Credit Facility by $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 million for a maximum commitment of $300.0 million, so long as the Company is not in default and the Company satisfies certain other customary conditions. On February 27, 2012, the Company entered into a third amendment to its Senior Secured Revolving Credit Facility (the "Third Amendment"). The Third Amendment amended the Senior Secured Revolving Credit Facility as to the definitions of consolidated fixed charges and consolidated fixed charge coverage ratio and does not permit the consolidated fixed charge coverage ratio as of the end of any fiscal quarter to be less than (i) for any fiscal quarter ending during the period from December 31, 2011 to and including September 30, 2012, 1.75 to 1.00 and (ii) for any fiscal quarter ending thereafter, 2.00 to 1.00. On August 27, 2012, the Company entered into a fourth amendment to its Senior Secured Revolving Credit Facility (the “Fourth Amendment”). The Fourth Amendment amended the Senior Secured Revolving Credit Facility to add the Australian dollar as an alternative currency and increased the alternative currency sublimit from USD $60.0 million to USD $100.0 million. On June 27, 2013, the Company entered into a fifth amendment to its Senior Secured Revolving Credit Facility (the “Fifth Amendment”). Among other changes, the Fifth Amendment modifies the Credit Agreement to permit an implementation of an auto-borrow agreement between the swing line lender and the Company to facilitate cash management, incorporates new provisions related to swap regulations and updates various provisions related to the LIBOR rate, Foreign Account Tax Compliance Act and the International Financial Reporting Standards. On February 3, 2014, the Company entered into a sixth amendment to its Senior Secured Revolving Credit Facility (the “Sixth Amendment”). The Sixth Amendment (i) allowed the Company to consummate the acquisition of Gould & Lamb, and (ii) allows the Company to acquire a target (a) with negative trailing twelve month adjusted EBITDA (as defined in the senior secured revolving credit facility) if the purchase price of such acquisition is less than $5.0 million, (b) with trailing twelve month adjusted EBITDA (as defined in the senior secured revolving credit facility) of less than or equal to $3,000,000 without delivering to the lenders a quality of earnings report regarding such target and (c) without delivering pro forma projections of the Company to the lenders if the purchase price of such acquisition is less than $75.0 million, in each case, without prior lender consent. On April 16, 2015, the Company entered into the Amended and Restated Credit Facility. 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 Amended and Restated Credit Facility was extended for five years from the date of the amendment to April 2020. Borrowings under the Amended and Restated 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: Pricing Tier Consolidated Leverage Ratio Commitment Fee/Unused Line Fee Letter of Credit Fee Eurocurrency Rate Loans Base Rate Loans 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 Amended and Restated 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 Amended and Restated 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 Amended and Restated Credit Facility ("First Amendment"). The First Amendment amended the definition of "Change of Control" in the Amended and Restated Credit Facility. As of March 31, 2016, the Company had $50.0 million outstanding under the Amended and Restated Credit Facility, resulting in $250.0 million of undrawn commitments.