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Note 8 - Debt: (Detail) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Line of Credit Facility, Increase, Additional Borrowings (in Dollars) $ (437,925,000) $ (444,134,000)  
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) 315,000,000    
Other Long-term Debt (in Dollars) 64,000,000    
Long-term Debt, Gross (in Dollars) 277,379,000   244,216,000
Line of Credit Facility, Current Borrowing Capacity (in Dollars) 315,000,000    
Line of Credit Facility, Amount Outstanding (in Dollars) 26,000,000    
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) 75,000,000    
Description of Interest Rate Cash Flow Hedge Activities 1.21%    
Prepaid Expense and Other Assets, Current (in Dollars) 9,417,000   13,112,000
Debt Instrument, Fee Amount (in Dollars) 1,200,000    
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred (in Dollars) 5,900,000    
Debt Instrument, Interest Rate at Period End 0.29%    
Interest Rate Swap Agreement 3.46%    
Amended [Member]
      
Line of Credit Facility, Increase, Additional Borrowings (in Dollars) 50,000,000    
Agent Base Rate Plus Premium [Member] | Minimum [Member] | Term Loan [Member]
      
Line of Credit Facility, Interest Rate Description 0.25%    
Agent Base Rate Plus Premium [Member] | Minimum [Member]
      
Line of Credit Facility, Interest Rate Description 0.00%    
Agent Base Rate Plus Premium [Member] | Maximum [Member] | Term Loan [Member]
      
Line of Credit Facility, Interest Rate Description 0.75%    
Agent Base Rate Plus Premium [Member] | Maximum [Member]
      
Line of Credit Facility, Interest Rate Description 0.50%    
LIBOR Rate [Member] | Minimum [Member] | Term Loan [Member]
      
Line of Credit Facility, Interest Rate Description 1.75%    
LIBOR Rate [Member] | Minimum [Member]
      
Line of Credit Facility, Interest Rate Description 1.50%    
LIBOR Rate [Member] | Maximum [Member] | Term Loan [Member]
      
Line of Credit Facility, Interest Rate Description 2.25%    
LIBOR Rate [Member] | Maximum [Member]
      
Line of Credit Facility, Interest Rate Description 2.00%    
Availability Dollar Amount [Member]
      
Line of Credit Facility, Covenant Terms $20    
Percentage of Commitments [Member]
      
Line of Credit Facility, Covenant Terms 12.5%    
Minimum [Member]
      
Description of Interest Rate Cash Flow Hedge Activities 1.75%    
Maximum [Member]
      
Description of Interest Rate Cash Flow Hedge Activities 2.25%    
Amortized Banking Fees [Member]
      
Prepaid Expense and Other Assets, Current (in Dollars) 5,000,000    
Term Loan [Member]
      
Long-term Debt, Gross (in Dollars) 59,800,000    
Outstanding [Member]
      
Long-term Debt, Gross (in Dollars) 36,000,000    
Industrial Revenue Bond [Member]
      
Long-term Debt, Gross (in Dollars) $ 5,100,000