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Note 7 - Floor Plan Notes Payable and Lines of Credit (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Assets Pledged As Collateral [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |
Inventories, new and used vehicles at cost based on specific identification, net of allowance |  | $ | 818,066 |  |  | $ | 642,205 |
Vehicle sale related accounts receivable |  |  | 104,778 |  |  |  | 83,482 |
Total |  | $ | 922,844 |  |  | $ | 725,687 |
Floor plan notes payable related to vehicles |  | $ | 778,561 |  |  | $ | 646,945 |

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