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Note 12 - Notes Payable (Details)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Apr. 30, 2007
USD ($)
Jul. 31, 2013
Canada, Dollars
Unsecured Debt [Member]
CAD
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit [Member]
Dec. 31, 2012
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit [Member]
Dec. 31, 2012
London Interbank Offered Rate (LIBOR) [Member]
Notes Payable, Other Payables [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Unsecured Debt [Member]
Dec. 31, 2013
TIIE [Member]
Mexican Term Loan [Member]
Dec. 31, 2013
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Dec. 31, 2012
Notes Payable, Other Payables [Member]
Mar. 31, 2013
Mexican Term Loan [Member]
MXN
Dec. 31, 2013
Mexican Term Loan [Member]
USD ($)
Dec. 31, 2013
Mexican Term Loan [Member]
MXN
May 31, 2013
Unsecured Debt [Member]
USD ($)
Apr. 30, 2007
Unsecured Debt [Member]
USD ($)
Dec. 31, 2013
Unsecured Debt [Member]
USD ($)
Jul. 31, 2013
Series 4 Unsecured Debt [Member]
CAD
Dec. 31, 2013
Letter of Credit [Member]
USD ($)
Note 12 - Notes Payable (Details) [Line Items]                                          
Debt Instrument, Basis Spread on Variable Rate           1.05% 1.05% 3.50% 1.05% 1.35%                      
Debt Instrument, Interest Rate at Period End                     1.22% 1.26% 5.50%   5.15% 5.15%          
Debt, Weighted Average Interest Rate                                     4.37%    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months                                     $ 694,700,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two                                     544,500,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three                                     300,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four                                     290,900,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five                                     517,700,000    
Long-term Debt, Maturities, Repayments of Principal after Year Five                                     838,200,000    
Proceeds from Issuance of Senior Long-term Debt                                 344,700,000 300,000,000      
Debt Covenants, Dividend Payment Restriction, Maximum Payment       26,000,000                                  
Debt Instrument, Face Amount                                 350,000,000     200,000,000  
Debt Instrument, Term                           5 years     10 years        
Debt Instrument, Interest Rate, Stated Percentage         5.18%                 8.58%     3.125%     3.855%  
Debt Issuance Cost                                 500,000        
Repayments of Senior Debt                                 75,000,000        
Debt Instrument, Face Amount (in Dollars)                                 350,000,000     200,000,000  
Repayments of Medium-term Notes (in Dollars)         200,000,000                                
Line of Credit Facility, Maximum Borrowing Capacity 1,750,000,000                                        
Debt Instrument, Additional Options, Term                     1 year                    
Line of Credit Facility, Commitment Fee Percentage 0.20%                                        
Line of Credit Facility, Competitive Bid Option 875,000,000                                        
Line of Credit Facility, Sub Limit 500,000,000                                        
Line of Credit Facility, Amount Outstanding 194,500,000                                       3,300,000
Unsecured Debt                             76,500,000 1,000,000,000     400,000,000    
Debt Instrument, Basis Spread on Variable Rate (in Basis Points)           1.05% 1.05% 3.50% 1.05% 1.35%                      
Number of Additional One-Year Options                                     3    
Option Term                                     1 year    
Proceeds from Issuance of Medium-term Notes (in Pesos)                           1,000,000,000              
Repayments of Unsecured Debt (in Pesos) 546,717,000 215,900,000 92,600,000                     1,000,000,000              
Unsecured Debt (in Pesos)                             $ 76,500,000 1,000,000,000     $ 400,000,000