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Note 7 - Fair Value of Financial Instruments (Detail) - Fair Value Measurements, Not Recorded (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | Industrial Revenue Bond [Member] |  |
Long Term Debt | $ 5,125 | $ 5,125
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Industrial Revenue Bond [Member] |  |
Long Term Debt | 230,372 | 235,179
Carrying Value [Member] | Industrial Revenue Bond [Member] |  |
Long Term Debt | 235,497 | 240,304
Fair Value, Inputs, Level 1 [Member] | Industrial Revenue Bond [Member] |  |
Long Term Debt | 5,125 | 5,125
Fair Value, Inputs, Level 2 [Member] | Term Loan [Member] |  |
Long Term Debt | 55,417 | 57,604
Fair Value, Inputs, Level 2 [Member] | Revolver [Member] |  |
Long Term Debt | 174,955 | 177,575
Industrial Revenue Bond [Member] |  |
Long Term Debt | 5,125 | 5,125
Term Loan [Member] |  |
Long Term Debt | 55,417 | 57,604
Revolver [Member] |  |
Long Term Debt | $ 174,955 | $ 177,575

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: 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 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant