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Note 10 - Shareholders' Equity (Details) - Stock Options Outstanding - $ / shares | 12 Months Ended
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Jan. 03, 2016 | Dec. 28, 2014 | Dec. 29, 2013
Stock Options Outstanding [Abstract] |  |  |  |  |
Shares |  | 126,000 |  |  |
Weighted average exercise price |  | $ 9.23 |  |  |
Exercisable at January 3, 2016 (b) | [1] | 87,500 |  |  |
Exercisable at January 3, 2016 (b) | [1] | $ 8.75 |  |  |
Granted |  | 0 |  | 2,014 | 0
Granted |  | $ 0 |  |  |
Exercised |  | 38,500 |  |  |
Exercised |  | $ 9.27 |  |  |
Forfeited or cancelled |  | 0 |  |  |
Forfeited or cancelled |  | $ 0 |  |  |
Shares |  | 87,500 | [2] | 126,000 |
Weighted average exercise price |  | $ 8.75 | [2] | $ 9.23 |
[1] | At January 3, 2016, the weighted-average remaining contractual life of options exercisable was 3.9 years.
[2] | At January 3, 2016, the weighted-average remaining contractual life of options outstanding was 3.9 years.

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- 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, 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 or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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