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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | Estimated Life (Years) |
Land |  | $ | 134,246 |  |  | $ | 98,033 |  |  |  | – |  |
Buildings and improvements |  |  | 313,706 |  |  |  | 233,742 |  |  | 10 | – | 39 |
Leasehold improvements |  |  | 28,149 |  |  |  | 27,100 |  |  | 2 | – | 39 |
Machinery and shop equipment |  |  | 59,455 |  |  |  | 48,988 |  |  | 5 | – | 20 |
Furniture, fixtures and computers |  |  | 74,201 |  |  |  | 57,730 |  |  | 3 | – | 15 |
Transportation equipment |  |  | 74,761 |  |  |  | 47,758 |  |  | 2 | – | 15 |
Lease and rental vehicles |  |  | 825,787 |  |  |  | 697,147 |  |  | 2 | – | 8 |
Construction in progress |  |  | 66,338 |  |  |  | 39,775 |  |  |  |  |  |
Accumulated depreciation and amortization |  |  | (403,819 | ) |  |  | (327,193 | ) |  |  |  |  |
Total |  | $ | 1,172,824 |  |  | $ | 923,080 |  |  |  |  |  |
Schedule of Goodwill [Table Text Block] |
Balance December 31, 2013 |  | $ | 215,464 |
Acquisitions |  |  | 49,609 |
Adjustment |  |  | 72 |
Balance December 31, 2014 |  |  | 265,145 |
Acquisitions |  |  | 19,896 |
Balance December 31, 2015 |  | $ | 285,041 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Expected stock volatility |  |  | 40.90% |  |  |  | 51.51% |  |  |  | 49.59% |
Weighted-average stock volatility |  |  | 40.90% |  |  |  | 51.51% |  |  |  | 49.59% |
Expected dividend yield |  |  | 0.0% |  |  |  | 0.0% |  |  |  | 0.0% |
Risk-free interest rate |  |  | 1.74% |  |  |  | 2.14% |  |  |  | 1.22% |
Expected life (years) |  |  | 6.0 |  |  |  | 6.5 |  |  |  | 6.5 |
Weighted-average fair value of stock options granted |  | $ | 11.27 |  |  | $ | 15.86 |  |  | $ | 12.69 |

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