Note 7 - Fair Value of Financial Instruments (Details) - Fair Value Measurements, Not Recorded (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	$ 4,340	$ 5,125
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	203,249	235,179
Carrying Value [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	0	0
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	207,589	240,304
Industrial Revenue Bond [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRB	4,340	5,125
Industrial Revenue Bond [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRB	0	0
Industrial Revenue Bond [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRB	0	0
Industrial Revenue Bond [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
IRB	4,340	5,125
Term Loan [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	0	0
Term Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	53,229	57,604
Term Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	0	0
Term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	53,229	57,604
Revolver [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	0	0
Revolver [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	150,020	177,575
Revolver [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	0	0
Revolver [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt	$ 150,020	$ 177,575