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Note 12 - Long-Term Debt and Convertible Debentures (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 2 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Mar. 02, 2012
Sep. 24, 2013
Dec. 31, 2013
Dec. 31, 2012
Jan. 16, 2013
Beginning January 16, 2021 [Member]
Jan. 16, 2013
3.84% Notes [Member]
Dec. 31, 2013
6.40% Senior Notes [Member]
Dec. 31, 2012
6.40% Senior Notes [Member]
Dec. 31, 2013
5.44% Senior Notes [Member]
Dec. 31, 2012
5.44% Senior Notes [Member]
Sep. 24, 2013
6.50% Convertible Debentures [Member]
Dec. 31, 2013
Minimum [Member]
Mar. 02, 2012
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Mar. 02, 2012
Maximum [Member]
Note 12 - Long-Term Debt and Convertible Debentures (Details) [Line Items]                              
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) $ 350,000                            
Line Of Credit Facility Increase In Borrowing Capacity (in Dollars) 100,000                            
Credit Facility Term 5 years                            
Debt Instrument, Interest Rate, Stated Percentage           3.84% 6.40%   5.44%   6.50%   1.25%   3.00%
Debt, Weighted Average Interest Rate     2.00% 2.20%                      
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)     166,349 81,247                      
Letters of Credit Outstanding, Amount (in Dollars)     7,770 10,513                      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                       0.25%   0.60%  
Senior Notes (in Dollars)           150,000 25,000 37,500 40,000 60,000          
Debt Instrument, Term           12 years           1 year   10 years  
Debt Instrument, Number of Annual Principal Repayments         5   4                
Number Of Annual Principal Payments                 5            
Convertible Subordinated Debt (in Dollars)       77,000             76,992        
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares)   2,744,886                          
Debt Instrument, Convertible, Conversion Price (in Dollars per share)                     $ 28.00        
Debt Instrument Convertible Debentures Number Of Equity Instruments   35.7143                          
Repayments of Convertible Debt (in Dollars)                     $ 143        
Debt Instrument, Interest Rate, Effective Percentage     4.50% 5.10%