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Note 4 - Related Party Transactions (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounts Payable, Related Parties | $ 29,000 | $ 0 |
Director [Member] | Construction Projects [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 10,000 | 154,000 |
Purchase of Fuel, Tires and Related Services [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 477,000 | 306,000 | $ 241,000
Tire Purchases [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 2,000,000.0 | $ 2,000,000.0 | $ 2,000,000.0

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- Definition Amount for accounts payable to related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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