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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $) | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME |  |  |
NET INCOME | $ 20,066,500 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 18,231,600 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 12,937,900 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Unrealized net gains/losses on marketable securities: |  |  |
Unrealized holding net gains/(losses) arising during period | (47,600)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (100)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (6,500)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification adjustment for net gains included in net income | (5,600)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax |  | (28,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
OTHER COMPREHENSIVE INCOME (LOSS), BEFORE TAX | (53,200)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (100)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (34,500)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Unrealized net gains/losses on marketable securities: |  |  |
Unrealized holding net gains/losses arising during period | 18,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax |  | 2,500 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for net gains included in net income | 2,200 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax |  | 11,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
INCOME TAX (EXPENSE) BENEFIT RELATED TO ITEMS OF OTHER COMPREHENSIVE INCOME | 20,200 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 |  | 13,500 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | (33,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (100)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (21,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
COMPREHENSIVE INCOME | $ 20,033,500 us-gaap_ComprehensiveIncomeNetOfTax | $ 18,231,500 us-gaap_ComprehensiveIncomeNetOfTax | $ 12,916,900 us-gaap_ComprehensiveIncomeNetOfTax

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