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Note 4 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Payable, Related Parties $ 0 $ 0  
Purchase Of Fuel Tires And Related Services [Member]      
Related Party Transaction, Amounts of Transaction 361,000 335,000 $ 562,000
Tire Purchases [Member]      
Related Party Transaction, Amounts of Transaction $ 2,000,000 $ 1,500,000 $ 1,400,000