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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% |  |  |  |  |  |  |  |  |  |  |

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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 + Details
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