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Stock Options, Stock Grants and New Stock (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Feb. 09, 2012 | Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011 | Dec. 29, 2012 Stock Options [Member] | Dec. 31, 2011 Stock Options [Member] | Jan. 01, 2011 Stock Options [Member] | Feb. 09, 2012 2011 Plan [Member] Stock Options [Member] | Jan. 24, 2011 2011 Plan [Member] Stock Options [Member] | Jan. 21, 2011 2011 Plan [Member] Stock Options [Member] | Dec. 29, 2012 1998 Plan [Member] Stock Options [Member] stock_option_plan | Dec. 29, 2012 2005 Stock Awards Plan [Member] Stock Awards [Member] | Dec. 31, 2011 2005 Stock Awards Plan [Member] Stock Awards [Member] | Jan. 01, 2011 2005 Stock Awards Plan [Member] Stock Awards [Member] | Aug. 21, 2012 President of Palmer [Member] | Aug. 21, 2012 President of Palmer [Member] 2011 Plan [Member] Stock Options [Member] | Dec. 29, 2012 Non Employee Director [Member] | Dec. 31, 2011 Non Employee Director [Member] individual | Jan. 01, 2011 Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorization of stock options (shares) |  |  | 350,000 |  |  |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |
Period after option grant before options can be exercised (years) |  |  |  |  |  |  |  |  |  | 1 year | 1 year | 1 year |  |  |  |  |  |  |
Annual vesting rate (percent) |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00% |  |  |  |  |  |  |
Options granted (shares) | 36,740 |  | 100,000 |  |  |  |  | 36,740 | 100,000 |  |  |  |  |  | 75,000 | 75,000 |  |  |
Options granted, weighted average exercise price (dollars per share) | $ 11.35 |  | $ 11.55 |  |  |  |  | $ 11.35 | $ 11.55 |  |  |  |  |  | $ 12.73 | $ 12.73 |  |  |
Options granted, weighted average fair value (dollars per share) | $ 5.03 | $ 6.40 | $ 7.93 | $ 0.00 |  |  |  | $ 5.03 | $ 7.93 |  |  |  |  |  | $ 5.44 | $ 5.44 |  |  |
Risk free interest rate (percent) |  |  |  |  |  |  |  | 2.04% | 3.34% |  |  |  |  |  |  | 1.80% |  |  |
Expected volatility rate (percent) |  |  |  |  |  |  |  | 53.00% | 0.49% |  |  |  |  |  |  | 51.00% |  |  |
Expected life (years) |  |  |  |  |  |  |  | 7 years | 7 years |  |  |  |  |  |  | 7 years |  |  |
Expected dividend yield (percent) |  |  |  |  |  |  |  | 2.10% | 2.10% |  |  |  |  |  |  | 2.10% |  |  |
Number of stock option plans (plans) |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  | 11,800 | 19,200 | 9,900 | 11,800 | 19,200 | 9,900 |  |  |  |  |  |  |  |  |  |  |  |
Option exercises, aggregate exercise price |  |  |  |  | $ 124,000 | $ 176,000 | $ 49,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash received from exercise of stock options |  |  |  |  | 123,888 | 161,903 | 39,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during year (shares) |  |  |  |  |  | 1,045 | 1,016 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during year |  |  |  |  |  | 14,000 | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (shares) |  | 29,000 |  |  | 29,000 | 20,800 | 44,000 |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable, weighted average exercise price (dollars per share) |  | $ 10.84 |  |  | $ 10.84 | $ 9.96 | $ 9.13 |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | 337,750 | 276,553 | 179,814 | 228,000 | 111,000 | 7,000 |  |  |  |  | 110,000 | 165,000 | 174,000 |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  | 1,046,000 |  |  |  |  |  |  | 262,000 |  |  |  |  |  |  |
Share-based compensation, weighted average period of recognition (years) |  |  |  |  | 3 years 9 months 15 days |  |  |  |  |  |  | 2 years 10 months 10 days |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 13,420 | 51,500 |  |  |  |  |
Share-based compensation expense, stock grants |  |  |  |  |  |  |  |  |  |  |  |  | 332,000 | 406,000 |  |  |  |  |
Share-based compensation expense, period of recognition (years) |  |  |  |  |  |  |  |  |  |  |  | 60 months |  |  |  |  |  |  |
Share-based compensation expense, net of taxes |  |  |  |  |  |  |  |  |  |  |  | 70,000 | 105,000 | 110,000 |  |  |  |  |
Share-based compensation expense, net of taxes, (dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.02 | $ 0.02 |  |  |  |  |
Treasury stock issued to each nonemployee director (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,598 |  |
Issuance of shares of common stock from the treasury (in shares) |  | 19,089 | 18,280 | 13,949 |  |  |  |  |  |  |  |  |  |  |  |  | 7,990 | 7,238 | 1,531
Annual cash retainer fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 | $ 15,000 | $ 15,000
Number of directors retiring during period (individual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Forfeitures of treasury stock issued to each nonemployee director (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,248 |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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