Note 4 - Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Purchase Of Fuel, Tires, and Related Services [Member]
Note 4 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction	$ 585,000	$ 988,000	$ 1,400,000
Tire Purchases [Member]
Note 4 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction	1,600,000	1,700,000	1,700,000
Various Construction Projects [Member]
Note 4 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction		$ 495,000	$ 615,000