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Note 7 - Share-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Common Shares |  |  | Weighted- |
|  | Options |  |  |  |  |  |  | Available |  |  | Average |
|  | Outstanding |  |  | Exercisable |  |  | for Grant |  |  | Exercise Price |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2015 |  |  | 2,419,529 |  |  |  | 724,529 |  |  |  | 837,635 |  |  | $ | 8.16 |
Authorized |  |  | — |  |  |  |  |  |  |  | 874,709 |  |  |  | — |
Granted |  |  | 160,000 |  |  |  |  |  |  |  | (160,000 | ) |  |  | 10.53 |
Exercised |  |  | (159,626 | ) |  |  |  |  |  |  | — |  |  |  | 10.24 |
Balance at March 31, 2016 |  |  | 2,419,903 |  |  |  | 564,903 |  |  |  | 1,552,344 |  |  | $ | 8.49 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 28, 2014 |  |  | 755,617 |  |  |  | 616,792 |  |  |  | 276,635 |  |  | $ | 6.09 |
Exercised |  |  | (2,500 | ) |  |  |  |  |  |  | — |  |  |  | 6.14 |
Balance at March 29, 2015 |  |  | 753,117 |  |  |  | 677,870 |  |  |  | 276,635 |  |  | $ | 6.09 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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