Note 10 - Long-Term Debt (Detail)	0 Months Ended		1 Months Ended	12 Months Ended											3 Months Ended		3 Months Ended
	Jul. 19, 2011 USD ($)	May 06, 2011 USD ($)	Feb. 27, 2012	Dec. 31, 2011 USD ($)	Jul. 15, 2015	Dec. 31, 2012 USD ($)	Jan. 15, 2012	Jul. 07, 2011 USD ($)	Feb. 09, 2011 USD ($)	Dec. 31, 2010 USD ($)	Nov. 02, 2010 USD ($)	Dec. 31, 2012 UKIM [Member] USD ($)	Mar. 31, 2013 Premex Group [Member] USD ($)	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]	Sep. 29, 2010 UKIM [Member] GBP (£)	Mar. 31, 2013 Premex Group [Member]	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 ($)	Dec. 31, 2010 Noninterest Bearing [Member] USD ($)	Dec. 31, 2012 Australian Dollars [Member] USD ($)
Senior Notes	$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	9.00%			9.00%			9.00%																	2.00%	6.00%
Proceeds from Issuance of Senior Long-term Debt	250,000,000
Debt Instrument Repurchase Percentage of Face Amount					101.00%
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000						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
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
Line of Credit Facility, Covenant Terms			1.00
Secured Revolving Credit Facility, Alternative Currency Sublimit				60,000,000		100,000,000
Debt Instrument, Basis Spread on Variable Rate																			2.50%		2.40%	0.50%	1.00%
Line of Credit Facility, Amount Outstanding						100,100,000						6,400,000	25,200,000														52,100,000
Line of Credit Facility, Remaining Borrowing Capacity						162,400,000						1,200,000	15,100,000
Debt Instrument, Interest Rate at Period End																		0.50%		0.50%
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred										6,900,000
Notes Payable																									4,400,000	2,500,000
Debt Instrument, Periodic Payment															50,000		76,000
Debt Instrument, Annual Principal Payment														$ 250,000		$ 750,000