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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | Estimated Life (Years) |
Land |  | $ | 134,873 |  |  | $ | 129,805 |  |  |  |  | – |  |
Buildings and improvements |  |  | 434,049 |  |  |  | 404,679 |  |  |  | 10 | – | 39 |
Leasehold improvements |  |  | 27,165 |  |  |  | 26,765 |  |  |  | 2 | – | 39 |
Machinery and shop equipment |  |  | 73,578 |  |  |  | 65,694 |  |  |  | 5 | – | 20 |
Furniture, fixtures and computers |  |  | 67,330 |  |  |  | 63,475 |  |  |  | 3 | – | 15 |
Transportation equipment |  |  | 92,385 |  |  |  | 81,158 |  |  |  | 2 | – | 15 |
Lease and rental vehicles |  |  | 914,708 |  |  |  | 894,905 |  |  |  | 2 | – | 8 |
Construction in progress |  |  | 16,310 |  |  |  | 8,043 |  |  |  |  |  |  |
Accumulated depreciation and amortization |  |  | (576,345 | ) |  |  | (514,929 | ) |  |  |  |  |  |
Total |  | $ | 1,184,053 |  |  | $ | 1,159,595 |  |  |  |  |  |  |
Schedule of Goodwill [Table Text Block] |
Balance January 1, 2017 |  | $ | 290,191 |
Acquisition |  |  | 1,200 |
Balance December 31, 2017 and 2018 |  | $ | 291,391 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Expected stock volatility |  |  | 31.68 | % |  |  | 33.54 | % |  |  | 35.63 | %
Weighted-average stock volatility |  |  | 31.68 | % |  |  | 33.54 | % |  |  | 35.63 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Risk-free interest rate |  |  | 2.69 | % |  |  | 2.17 | % |  |  | 1.64 | %
Expected life (years) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Weighted-average fair value of stock options granted |  | $ | 15.46 |  |  | $ | 12.33 |  |  | $ | 6.54 |

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