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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

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.

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