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Note 12 - Marketable Securities (Detail)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2010
AUD
Feb. 29, 2008
Valad [Member]
Investee's Option [Member]
Dec. 31, 2011
Valad [Member]
Including Unpaid Interest [Member]
USD ($)
Dec. 31, 2011
Valad [Member]
Including Unpaid Interest [Member]
AUD
Dec. 31, 2011
Valad [Member]
From OCI [Member]
USD ($)
Feb. 29, 2008
Valad [Member]
USD ($)
Feb. 29, 2008
Valad [Member]
AUD
Dec. 31, 2011
Valad [Member]
USD ($)
Dec. 31, 2011
Valad [Member]
CAD
Dec. 31, 2010
Valad [Member]
USD ($)
Dec. 31, 2010
Valad [Member]
AUD
Dec. 31, 2011
Valad [Member]
AUD
Dec. 31, 2011
Gross [Member]
USD ($)
Dec. 31, 2010
Gross [Member]
USD ($)
Dec. 31, 2012
Impairments [Member]
USD ($)
Dec. 31, 2011
Impairments [Member]
USD ($)
Dec. 31, 2010
Impairments [Member]
USD ($)
Dec. 31, 2012
Additional [Member]
Minimum [Member]
Dec. 31, 2012
Additional [Member]
Maximum [Member]
Dec. 31, 2012
Additional 1 [Member]
Minimum [Member]
Dec. 31, 2012
Additional 1 [Member]
Maximum [Member]
Dec. 31, 2012
Certain Marketable Securities [Member]
USD ($)
Dec. 31, 2011
Certain Marketable Securities [Member]
USD ($)
Dec. 31, 2010
Certain Marketable Securities [Member]
USD ($)
Payments to Acquire Marketable Securities     $ 9,041,000           $ 170,100,000 190,000,000     $ 9,300,000 10,000,000                          
Investment Interest Rate                 9.50% 9.50%                                  
Period Prior to Repayment Term         18       5 5                                  
Debt Instrument, Convertible, Conversion Price (in Dollars per share)                   26.60                                  
Debt Instrument, Annual Principal Payment                     6,900,000   7,900,000 8,000,000 7,000,000                        
Proceeds from Sale of Available-for-sale Securities, Debt           174,700,000 170,200,000       169,100,000 165,000,000                              
Investment Foreign Currency, Contract, Foreign Currency Amount (in Dollars)                             165,000,000                        
Investment Foreign Currency, Contract, Reporting Currency Amount at Date of Origin                     169,100,000                                
Marketable Securities, Realized Gain (Loss)               10,000,000     900,000                                
Marketable Securities, Unrealized Gain (Loss)     6,000,000                                                
Embedded Derivative, Fair Value of Embedded Derivative Asset     10,200,000 10,000,000                                              
Unrealized Gain (Loss) on Derivatives     200,000 200,000                                              
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount   1,600,000 5,300,000                         600,000 4,600,000                    
Income Tax Expense (Benefit) 3,939,000 21,330,000 3,208,000                             10,700,000 400,000 0              
Proceeds from Sale and Maturity of Marketable Securities 156,000 188,003,000 30,455,000                                           100,000 22,700,000 23,200,000
Available-for-sale Securities, Gross Realized Gains 0 800,000 2,600,000                                                
Foreign Currency Transaction Gain (Loss), Realized 0 1,600,000 0                                                
Available-for-sale Securities, Gross Realized Losses 0 300,000 1,900,000                                                
Number of Years                                         1 5 5 10      
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 100,000                                                    
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount $ 3,000,000