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Note 8 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Class of Treasury Stock [Table Text Block] |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Shares repurchased pursuant to repurchase plan |  |  | 228,737 |  |  |  | 226,729 |  |  |  | 127,900 |
Total purchase price (in thousands) |  | $ | 24,676 |  |  | $ | 15,990 |  |  | $ | 5,213 |
Average purchase price per share |  | $ | 107.88 |  |  | $ | 70.52 |  |  | $ | 40.76 |
Shares repurchased in association with tax withholdings on the exercise of stock options |  |  | 77,649 |  |  |  | 106,772 |  |  |  | 59,721 |
Dividends Declared [Table Text Block] |
Quarter declared |  | Dividend amount per Class A and Class B share |  |  | Total amount of dividend (in thousands) |
2013 |  |  |  |  |  |  |  |
First quarter (1) |  | $ | — |  |  | $ | — |
Second quarter |  |  | 0.13 |  |  |  | 3,356 |
Third quarter |  |  | 0.13 |  |  |  | 3,363 |
Fourth quarter |  |  | 0.13 |  |  |  | 3,366 |
2014 |  |  |  |  |  |  |  |
First quarter |  | $ | 0.13 |  |  | $ | 3,378 |
Second quarter |  |  | 0.16 |  |  |  | 4,179 |
Third quarter |  |  | 0.16 |  |  |  | 4,174 |
Fourth quarter |  |  | 0.16 |  |  |  | 4,198 |
2015 |  |  |  |  |  |  |  |
First quarter |  | $ | 0.16 |  |  | $ | 4,216 |
Second quarter |  |  | 0.20 |  |  |  | 5,266 |
Third quarter |  |  | 0.20 |  |  |  | 5,257 |
Fourth quarter |  |  | 0.20 |  |  |  | 5,246 |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
Year Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |  | Affected Line Item in the Consolidated Statement of Operations |
Loss on cash flow hedges |  | $ | (449 | ) |  | $ | (488 | ) |  | $ | (740 | ) | Floor plan interest expense |
Income tax benefits |  |  | 174 |  |  |  | 187 |  |  |  | 283 |  | Income tax provision |
Loss on cash flow hedges, net |  | $ | (275 | ) |  | $ | (301 | ) |  | $ | (457 | ) |  |

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