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Consolidated Statements of Shareholders' Equity (USD $) | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | ---
BALANCE at Dec. 31, 2011 | $ 629,800 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 34,461,900 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 17,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 35,108,700 us-gaap_StockholdersEquity
BALANCE (in shares) at Dec. 31, 2011 | 4,987,643 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Repurchase of common stock | (3,874,900)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (3,345,400)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (7,220,300)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchase of common stock (in shares) | (134,720)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised and related tax benefits | 2,314,900 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 2,314,900 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock options exercised and related tax benefits (in shares) | 143,536 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Compensation expense relating to stock options | 930,200 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 930,200 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cash dividends |  | (26,122,400)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (26,122,400)us-gaap_DividendsCommonStockCash
Comprehensive income (loss) |  | 12,937,900 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (21,000)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 12,916,900 us-gaap_ComprehensiveIncomeNetOfTax
BALANCE at Dec. 29, 2012 |  | 17,932,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (4,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 17,928,000 us-gaap_StockholdersEquity
BALANCE (in shares) at Dec. 29, 2012 | 4,996,459 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Repurchase of common stock | (1,854,900)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (1,854,900)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchase of common stock (in shares) | (28,422)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised and related tax benefits | 3,650,800 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 3,650,800 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock options exercised and related tax benefits (in shares) | 175,493 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Compensation expense relating to stock options | 1,153,600 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,153,600 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cash dividends |  | (964,300)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (964,300)us-gaap_DividendsCommonStockCash
Comprehensive income (loss) |  | 18,231,600 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (100)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 18,231,500 us-gaap_ComprehensiveIncomeNetOfTax
BALANCE at Dec. 28, 2013 | 2,949,500 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 35,199,300 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (4,100)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 38,144,700 us-gaap_StockholdersEquity
BALANCE (in shares) at Dec. 28, 2013 | 5,143,530 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 5,143,530 us-gaap_CommonStockSharesIssued
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Repurchase of common stock | (4,453,400)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (7,111,400)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (11,564,800)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchase of common stock (in shares) | (166,030)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised and related tax benefits | 509,100 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 509,100 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock options exercised and related tax benefits (in shares) | 21,012 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Compensation expense relating to stock options | 1,417,200 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,417,200 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cash dividends |  | (26,930,200)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (26,930,200)us-gaap_DividendsCommonStockCash
Comprehensive income (loss) |  | 20,066,500 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (33,000)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 20,033,500 us-gaap_ComprehensiveIncomeNetOfTax
BALANCE at Dec. 27, 2014 | $ 422,400 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 21,224,200 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (37,100)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 21,609,500 us-gaap_StockholdersEquity
BALANCE (in shares) at Dec. 27, 2014 | 4,998,512 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 4,998,512 us-gaap_CommonStockSharesIssued

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