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Note 12 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
|  | Common |
|  | Stock |
Shares as of December 28, 2013 |  |  | 17,386,920 |
Shares issued under employee stock plans, net of shares withheld in lieu of tax withholding |  |  | 300,705 |
Repurchase of shares |  |  | (326,990 | )
Shares as of January 3, 2015 |  |  | 17,360,635 |
Shares issued under employee stock plans, net of shares withheld in lieu of tax withholding |  |  | 141,827 |
Repurchase of shares |  |  | (1,706,571 | )
Shares as of January 2, 2016 |  |  | 15,795,891 |
Shares issued under employee stock plans, net of shares withheld in lieu of tax withholding |  |  | 193,538 |
Repurchase of shares |  |  | (132,502 | )
Shares as of December 31, 2016 |  |  | 15,856,927 |

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