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Note 4 - Related Party Transactions (Details) (USD $) | 12 Months Ended
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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

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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