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Note 4 - Long-Term Debt (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Line of Credit Facility, Expiration Date May 31, 2016
Line of Credit Facility, Current Borrowing Capacity $ 50,000,000
Line of Credit Facility, Maximum Borrowing Capacity 75,000,000
Line of Credit Facility, Amount Outstanding 821,000
Letters of Credit Outstanding, Amount 8,300,000
Line of Credit Facility, Remaining Borrowing Capacity $ 40,900,000
Debt, Weighted Average Interest Rate 0.99%