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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | 20 17 |  |  | 201 6 |  |  | Estimated Life (Years) |
Land |  | $ | 129,805 |  |  | $ | 126,123 |  |  |  | – |  |
Buildings and improvements |  |  | 404,679 |  |  |  | 377,070 |  |  | 10 | – | 39 |
Leasehold improvements |  |  | 26,765 |  |  |  | 26,925 |  |  | 2 | – | 39 |
Machinery and shop equipment |  |  | 65,694 |  |  |  | 67,558 |  |  | 5 | – | 20 |
Furniture, fixtures and computers |  |  | 63,475 |  |  |  | 73,912 |  |  | 3 | – | 15 |
Transportation equipment |  |  | 81,158 |  |  |  | 73,156 |  |  | 2 | – | 15 |
Lease and rental vehicles |  |  | 894,905 |  |  |  | 832,661 |  |  | 2 | – | 8 |
Construction in progress |  |  | 8,043 |  |  |  | 11,921 |  |  |  |  |  |
Accumulated depreciation and amortization |  |  | (514,929 | ) |  |  | (453,521 | ) |  |  |  |  |
Total |  | $ | 1,159,595 |  |  | $ | 1,135,805 |  |  |  |  |  |
Schedule of Goodwill [Table Text Block] |
Balance January 1, 2016 |  | $ | 285,041 |
Acquisitions and adjustments |  |  | 5,150 |
Balance December 31, 201 6 |  |  | 290,191 |
Acquisition |  |  | 1,200 |
Balance December 31, 201 7 |  | $ | 291,391 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 20 17 |  |  | 20 16 |  |  | 20 15 |
Expected stock volatility |  |  | 33.54 | % |  |  | 35.63 | % |  |  | 40.90 | %
Weighted-average stock volatility |  |  | 33.54 | % |  |  | 35.63 | % |  |  | 40.90 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Risk-free interest rate |  |  | 2.17 | % |  |  | 1.64 | % |  |  | 1.74 | %
Expected life (years) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Weighted-average fair value of stock options granted |  | $ | 12.33 |  |  | $ | 6.54 |  |  | $ | 11.27 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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