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Debt (Details) (USD $) | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  |
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Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011 | Jan. 02, 2010 | Nov. 13, 2009 | Nov. 02, 2006 | Dec. 29, 2012 Minimum [Member] | Jan. 25, 2012 Revolving Credit Loan [Member] | Nov. 13, 2009 Revolving Credit Loan [Member] | Jun. 19, 2009 Revolving Credit Loan [Member] | Apr. 21, 2009 Revolving Credit Loan [Member] | Sep. 22, 2006 Revolving Credit Loan [Member] | Dec. 29, 2012 Revolving Credit Loan [Member] | Dec. 31, 2011 Revolving Credit Loan [Member] | Jan. 02, 2010 Revolving Credit Loan [Member] | Jan. 29, 2010 Revolving Credit Loan [Member] | Sep. 22, 2006 Revolving Credit Loan [Member] Minimum [Member] | Apr. 21, 2009 Revolving Credit Loan [Member] Minimum [Member] | Sep. 22, 2006 Revolving Credit Loan [Member] Maximum [Member] | Apr. 21, 2009 Revolving Credit Loan [Member] Maximum [Member] | Dec. 29, 2012 Loan Agreement [Member] | Sep. 22, 2006 2006 Term Loan [Member] | Jan. 29, 2010 Term Loan [Member] | Dec. 29, 2012 Term Loan [Member] | Jan. 25, 2012 2012 Term Loan Member] | Dec. 29, 2012 2012 Term Loan Member] | Apr. 21, 2009 Prior Loan Agreement [Member] Minimum [Member] | Apr. 21, 2009 Prior Loan Agreement [Member] Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 3,000,000 |  | $ 3,000,000 | $ 12,000,000 |  |  |  | $ 10,000,000 |  |  |  |  |  | $ 20,000,000 | $ 5,000,000 |  | $ 5,000,000 |  |  |
Periodic payment of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 714,286 | 178,571 |  | 178,571 |  |  |
Term of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years | 7 years |  | 7 years |  |  |
Maturity date of loan |  |  |  |  |  |  |  |  |  |  |  | Sep. 22, 2009 |  |  |  |  |  |  |  |  |  | Sep. 22, 2013 | Jan. 31, 2017 |  | Jan. 31, 2019 |  |  |
Revolving credit portion commitment fee (in hundredths) |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  | 0.10% |  | 0.25% |  |  |  | 0.25% |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  | LIBOR rate or People's Prime rate |  |  | LIBOR |  | LIBOR | LIBOR rate or People's Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in hundredths) |  |  |  |  |  |  |  | 2.25% | 2.25% | 2.25% |  |  | 2.25% |  |  |  |  | 1.00% |  | 1.60% |  |  |  |  |  |  | 1.00% | 1.65%
Fixed rate of interest (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.98% |  | 3.90% |  |
Floor rate of loan (in hundredths) |  |  |  |  |  |  |  | 3.25% |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused line fee (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio as multiple, minimum |  |  |  |  |  |  |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |  |  |  |  |
Leverage coverage ratio as multiple maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75 |  |  |  |  |  |  |
Consolidated cash balance required following dividend payments |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contract [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount, percentage of term loan outstanding (in hundredths) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate on swap contract (in hundredths) |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floor interest rate (in hundredths) |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination interest rate swap contract |  |  |  | 967,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | 10,714,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from line of credit used to fund discretionary pension payment | 0 | 3,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt | 7,499,999 | 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit loan | 0 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 7,499,999 | 6,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less current portion | 1,428,571 | 3,714,286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, less current portion | 6,071,428 | 3,035,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid | 349,972 | 240,635 |  | 317,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible net worth | 48,500,000 | 45,800,000 |  |  |  |  | 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible net worth (in hundredths) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled annual principal maturities of long-term debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 1,428,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 1,785,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 1,071,429 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 1,428,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 892,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 892,857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt | $ 7,499,999 | $ 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph 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 interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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