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Note 9 - Credit Facilities and Capital Leases (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Apr. 30, 2013
Apr. 12, 2013
Dec. 31, 2012
Oct. 31, 2009
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Face Amount     $ 500,000,000    
Underwriting Discount on Senior Notes     2.00%    
Debt Instrument, Unamortized Discount 9,600,000   10,000,000    
Debt Instrument, Interest Rate, Stated Percentage 6.875% 6.875%      
Interest Costs Capitalized 3,900,000        
Interest Expense, Debt 12,600,000        
Proceeds from Issuance of Senior Long-term Debt 490,000,000        
Percentage of Notes Redeemable 35.00%        
Increase In Annual Rate While In Default 0.25%        
Increase In Annual Interest Rate 1.00%        
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000 150,000,000     60,000,000
Debt Instrument, Covenant Description 2.50        
Capital Leases Including Purchase Option 20,000,000        
Capital Lease Obligations, Current 7,398,000     5,564,000  
Capital Lease Obligations, Noncurrent 12,603,000     11,935,000  
Capital Lease Obligations 19,931,000     17,500,000  
Capital Leases, Future Minimum Payments Due 20,809,000        
Capital Leases, Future Minimum Payments, Interest Included in Payments 878,000        
Leverage Ratio [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Covenant Description 4.00        
Interest Coverage Ratio [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Covenant Description 3.0        
Tangible Net Worth [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Covenant Description 80%        
Positive Quarterly Net Income [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Covenant Description 50%        
Commitment Fees On Credit Agreement [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Interest Expense, Debt 400,000        
Amortization of Loan Origination Fees [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Interest Expense, Debt $ 800,000        
Minimum [Member] | LIBOR [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 3.00%        
Minimum [Member] | Alternative Base Rate [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.00%        
Minimum [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Standby Fee Percentage 0.825%        
Maximum [Member] | LIBOR [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 4.50%        
Maximum [Member] | Alternative Base Rate [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 3.50%        
Maximum [Member]
          
Note 9 - Credit Facilities and Capital Leases (Details) [Line Items]          
Standby Fee Percentage 1.05%