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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 | 0 Months Ended | 3 Months Ended | 0 Months Ended |
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Sep. 30, 2013 | Feb. 07, 2013 | Feb. 09, 2012 | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 28, 2013 Stock Options [Member] | Dec. 29, 2012 Stock Options [Member] | Dec. 31, 2011 Stock Options [Member] | Feb. 07, 2013 2011 Plan [Member] 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. 28, 2013 2011 Plan [Member] Stock Options [Member] | Dec. 28, 2013 1998 Plan [Member] Stock Options [Member] stock_option_plan | Dec. 28, 2013 2005 Stock Awards Plan [Member] Stock Awards [Member] | Dec. 29, 2012 2005 Stock Awards Plan [Member] Stock Awards [Member] | Dec. 31, 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. 28, 2013 Non Employee Director [Member] | Dec. 29, 2012 Non Employee Director [Member] individual | Dec. 31, 2011 Non Employee Director [Member] | Sep. 30, 2013 Public Offering [Member] Common Stock [Member] | Dec. 28, 2013 Public Offering [Member] Common Stock [Member] | Sep. 30, 2013 Over-Allotment Option [Member] Common Stock [Member] | Apr. 25, 2013 Restricted Stock [Member] 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 | 1 year |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |
Options granted (shares) |  | 40,594 | 36,740 |  | 100,000 |  |  |  |  | 40,594 | 36,740 | 100,000 |  |  |  |  |  |  | 75,000 | 75,000 |  |  |  |  |  |  |
Options granted, weighted average exercise price (dollars per share) |  | $ 13.70 | $ 11.35 |  |  | $ 11.55 |  |  |  | $ 13.70 | $ 11.35 | $ 11.55 |  |  |  |  |  |  | $ 12.73 | $ 12.73 |  |  |  |  |  |  |
Options granted, weighted average fair value (dollars per share) |  | $ 6.30 | $ 5.03 | $ 7.19 | $ 6.40 | $ 7.93 |  |  |  | $ 6.30 | $ 5.03 | $ 7.93 |  |  |  |  |  |  | $ 5.44 | $ 5.44 |  |  |  |  |  |  |
Risk free interest rate (percent) |  |  |  |  |  |  |  |  |  | 2.00% | 2.04% | 3.34% |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |
Expected volatility rate (percent) |  |  |  |  |  |  |  |  |  | 53.00% | 53.00% | 49.00% |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |
Expected life (years) |  |  |  |  |  |  |  |  |  | 7 years | 7 years | 7 years |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Expected dividend yield (percent) |  |  |  |  |  |  |  |  |  | 1.80% | 2.10% | 2.10% |  |  |  |  |  |  |  | 2.10% |  |  |  |  |  |  |
Number of stock option plans (plans) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  |  |  | 15,247 | 11,800 | 19,200 | 15,247 | 11,800 | 19,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option exercises, aggregate exercise price |  |  |  |  |  |  | $ 163,000 | $ 124,000 | $ 176,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from exercise of stock options |  |  |  |  |  |  | 138,026 | 123,888 | 162,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  | 1,752 |  | 1,045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during year |  |  |  |  |  |  | 25,000 |  | 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (shares) |  |  |  | 40,591 |  |  | 40,591 | 29,000 | 20,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable, weighted average exercise price (dollars per share) |  |  |  | $ 11.26 |  |  | $ 11.26 | $ 10.84 | $ 9.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 331,362 | 337,750 | 276,553 | 249,000 | 228,000 | 111,000 |  |  |  |  |  |  | 82,000 | 110,000 | 165,000 |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | 668,000 |  |  |  |  |  |  |  |  | 143,000 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, weighted average period of recognition (years) |  |  |  |  |  |  | 2 years 8 months 5 days |  |  |  |  |  |  |  |  | 1 year 11 months 15 days |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 13,420 |  |  |  |  |  |  |  |  |
Share-based compensation expense, period of recognition (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 months |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense, net of taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,000 | 70,000 | 105,000 |  |  |  |  |  |  |  |  |
Share-based compensation expense, net of taxes, (dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.02 |  |  |  |  |  |  |  |  |
Treasury stock issued to each nonemployee director (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,598 |  |  |  |  |
Issuance of shares of common stock from the treasury (in shares) |  |  |  | 17,572 | 19,089 | 18,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,411 | 7,990 | 7,238 |  |  |  |
Annual cash retainer fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,000 | 20,000 | 15,000 |  |  |  |
Number of directors retiring during period (individual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Forfeitures of treasury stock issued to each nonemployee director (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,248 |  |  |  |  |
Maximum annual retainer percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Issuance of common stock (shares) |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  | 300,000 |
Price of stock (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.75 |  | $ 15.75 |
Proceeds from Issuance of Common Stock | 34,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Planned Payments to Acquire Machinery and Equipment | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,061,000 |  |

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -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 b(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 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 Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + 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 Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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