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Note 6 - Credit Facilities and Capital Leases (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Apr. 30, 2013
Apr. 12, 2013
Dec. 31, 2011
Oct. 31, 2009
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000   $ 150,000,000     $ 60,000,000
Long-term Line of Credit           60,000,000
Amortization of Deferred Charges   500,000        
Interest Expense, Debt 5,900,000 1,000,000        
Debt Instrument, Covenant Description 2.50          
Capital Leases Including Purchase Option 20,800,000 17,500,000        
Capital Lease Obligations, Current 7,128,000 5,564,000     4,005,000  
Capital Lease Obligations, Noncurrent 13,671,000 11,935,000     6,265,000  
Capital Lease Obligations 20,671,000 17,499,000     10,300,000  
Debt Instrument, Face Amount       500,000,000    
UnderwritingDiscountOnSeniorNotes       2.00%    
Debt Instrument, Unamortized Discount 9,900,000     10,000,000    
Debt Instrument, Interest Rate, Stated Percentage 6.875%          
Interest Costs Capitalized 1,700,000          
Proceeds from Issuance of Senior Long-term Debt 490,000,000          
PercentageOfNotesRedeemable 35.00%          
IncreaseInAnnualRateWhileInDefault 0.25%          
IncreaseInAnnualInterestRate 1.00%          
Capital Leases, Future Minimum Payments Due 21,631,000 18,419,000        
Capital Leases, Future Minimum Payments, Interest Included in Payments 960,000 920,000        
Leverage Ratio [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Covenant Description 4.00 Leverage ratio (calculated as total debt divided by EBITDA) of not more than 3.0:1.        
Interest Coverage Ratio [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Covenant Description 3.0 Interest coverage ratio (calculated as EBITDA divided by interest expense) of not less than 3.0:1.        
Current Ratio [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Covenant Description   Current ratio (calculated as current assets divided by current liabilities) of not less than 1.10:1.        
Tangible Net Worth [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Covenant Description 80% Tangible net worth of greater than $500 million.        
Positive Quarterly Net Income [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Covenant Description 50%          
LIBOR [Member] | Minimum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   3.00%        
LIBOR [Member] | Maximum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   3.75%        
Alternative Base Rate [Member] | Minimum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   2.00%        
Alternative Base Rate [Member] | Maximum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   2.75%        
Commitment Fees On Credit Agreement [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Interest Expense, Debt 300,000          
Amortization Of Loan Origination Fees [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Interest Expense, Debt 600,000          
Senior Secured Revolving Credit Facility [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 150,000,000        
Minimum [Member] | LIBOR [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 3.00%          
Minimum [Member] | Alternative Base Rate [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.00%          
Minimum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Standby Fee Percentage 0.825% 0.825%        
Maximum [Member] | LIBOR [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 3.75%          
Maximum [Member] | Alternative Base Rate [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Debt Instrument, Basis Spread on Variable Rate 2.75%          
Maximum [Member]
            
Note 6 - Credit Facilities and Capital Leases (Details) [Line Items]            
Standby Fee Percentage 1.05% 1.05%