Note 4 - Related Party Transactions (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Purchase Of Fuel, Tires, and Related Services [Member]
Related Party Transaction, Amounts of Transaction	$ 988,000	$ 1,400,000	$ 815,000
Tire Purchases [Member]
Related Party Transaction, Amounts of Transaction	1,700,000	1,700,000	1,700,000
Accounts Payable, Related Parties		28,000
Various Construction Projects [Member]
Related Party Transaction, Amounts of Transaction	$ 495,000	$ 615,000	$ 262,000