Note 6 - Stock Option Activity (Details) - USD ($) |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 27, 2015 |
Dec. 28, 2014 |
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| Numberof options, Outstanding (in shares) | 655,114 | 817,212 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 1.97 | $ 2.07 |
| Outstanding, weighted average instrinsic value | $ 0 | $ 0 |
| Outstanding, weighted average remaining contractual term (years) | 6 years 292 days | 7 years 109 days |
| Numberof options, Expired (in shares) | (66,667) | |
| Expired, weighted average exercise price (in dollars per share) | $ 3.11 | |
| Numberof options,Forfeited (in shares) | (95,431) | |
| Forfeited, weighted average exercise price (in dollars per share) | $ 2.03 | |
| Numberof options, Exercisable at June 28, 2015 (in shares) | 198,335 | |
| Weighted average exercise price, Exercisable at June 28, 2015 (in dollars per share) | $ 2.34 | |
| Exercisable at June 28, 2015, weighted average instrinsic value | $ 0 | |
| Exercisable at June 28, 2015, weighted average remaining contractual term (years) | 2 years 182 days |
| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. No definition available.
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| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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