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INCOME TAXES (Details) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Property, plant and equipment | $ 6,503,597 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | $ 6,184,873 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | $ 5,942,048 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other | 92,531 us-gaap_DeferredTaxLiabilitiesOther | 208,938 us-gaap_DeferredTaxLiabilitiesOther | 0 us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities | 6,596,128 us-gaap_DeferredIncomeTaxLiabilities | 6,393,811 us-gaap_DeferredIncomeTaxLiabilities | 5,942,048 us-gaap_DeferredIncomeTaxLiabilities
Other postretirement benefits | (1,030,203)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | (787,087)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | (885,729)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Inventories | (829,876)us-gaap_DeferredTaxAssetsInventory | (848,364)us-gaap_DeferredTaxAssetsInventory | (761,613)us-gaap_DeferredTaxAssetsInventory
Allowance for doubtful accounts | (105,296)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | (104,695)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | (104,903)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Intangible assets | (396,541)us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | (373,482)us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | (422,443)us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Accrued compensation | (203,180)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | (158,866)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | (197,582)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Pensions | (9,275,949)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | (3,828,224)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | (7,128,057)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Other | 0 us-gaap_DeferredTaxAssetsOther | 0 us-gaap_DeferredTaxAssetsOther | (116,826)us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets | (11,841,045)us-gaap_DeferredTaxAssetsGross | (6,100,718)us-gaap_DeferredTaxAssetsGross | (9,617,153)us-gaap_DeferredTaxAssetsGross
Net deferred income tax (assets) liabilities | (5,244,917)us-gaap_DeferredTaxAssetsLiabilitiesNet | 293,093 us-gaap_DeferredTaxAssetsLiabilitiesNet | (3,675,105)us-gaap_DeferredTaxAssetsLiabilitiesNet
Income before income taxes [Abstract] |  |  |
Domestic | 8,087,552 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 7,139,039 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 8,614,664 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign | 3,441,211 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 2,974,856 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 4,609,854 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes | 11,528,763 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,113,895 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,224,518 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current: |  |  |
Federal | 2,339,917 us-gaap_CurrentFederalTaxExpenseBenefit | 1,942,271 us-gaap_CurrentFederalTaxExpenseBenefit | 1,909,172 us-gaap_CurrentFederalTaxExpenseBenefit
Foreign | 991,257 us-gaap_CurrentForeignTaxExpenseBenefit | 871,949 us-gaap_CurrentForeignTaxExpenseBenefit | 1,367,025 us-gaap_CurrentForeignTaxExpenseBenefit
State | 295,554 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 162,952 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 220,820 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred: |  |  |
Federal | 164,830 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 241,821 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 1,022,660 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign | 0 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 0 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 0 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State | 75,729 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (7,019)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 79,041 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Provision for income taxes | 3,867,287 us-gaap_IncomeTaxExpenseBenefit | 3,211,974 us-gaap_IncomeTaxExpenseBenefit | 4,598,718 us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income taxes computed using U.S. federal statutory rate to that reflected in operations [Abstract] |  |  |
Income taxes using U.S. federal statutory rate | 3,919,779 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 3,438,724 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 4,496,336 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit | 249,324 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 99,245 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 188,490 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Impact of foreign subsidiaries on effective tax rate | (76,914)us-gaap_ForeignEarningsRepatriated | (103,878)us-gaap_ForeignEarningsRepatriated | 136,590 us-gaap_ForeignEarningsRepatriated
Impact of manufacturers deduction on effective tax rate | (185,993)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (138,127)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (232,928)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Other-net | (38,909)us-gaap_IncomeTaxReconciliationOtherAdjustments | (83,990)us-gaap_IncomeTaxReconciliationOtherAdjustments | 10,230 us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes | 3,867,287 us-gaap_IncomeTaxExpenseBenefit | 3,211,974 us-gaap_IncomeTaxExpenseBenefit | 4,598,718 us-gaap_IncomeTaxExpenseBenefit
Income taxes using U.S. federal statutory rate (in hundredths) | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit (in hundredths) | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Impact of foreign subsidiaries on effective tax rate (in hundredths) | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Impact of manufacturers deduction on effective tax rate (in hundredths) | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther | (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Other-net (in hundredths) | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (in hundredths) | 34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Total income taxes paid | 3,989,978 us-gaap_IncomeTaxesPaid | 2,568,708 us-gaap_IncomeTaxesPaid | 3,350,283 us-gaap_IncomeTaxesPaid
Undistributed earnings of foreign subsidiaries | 13,656,236 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options | 8,882 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Reconciliation of the beginning and ending amount of unrecognized tax benefits [Roll Forward] |  |  |
Balance at beginning of year | 220,289 us-gaap_UnrecognizedTaxBenefits | 499,624 us-gaap_UnrecognizedTaxBenefits | 486,332 us-gaap_UnrecognizedTaxBenefits
Increases for positions taken during the current period | 50,735 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 49,636 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 119,893 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decreases relating to settlements | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (263,856)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Decreases resulting from the expiration of the statute of limitations | (22,379)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (65,115)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (106,601)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at end of year | 248,645 us-gaap_UnrecognizedTaxBenefits | 220,289 us-gaap_UnrecognizedTaxBenefits | 499,624 us-gaap_UnrecognizedTaxBenefits
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits that would affect the annual effective tax rate | 164,106 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Accrued interest related to unrecognized tax benefits | $ 33,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  |
U.S. federal [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open tax year | 2011 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open tax year | 2011 |  |
Foreign Jurisdiction [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Open tax year | 2008 |  |

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