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Consolidated Balance Sheets (Parenthetical) (USD $) | Jan. 03, 2015 | Dec. 28, 2013
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Current assets |  |
Accounts receivable, allowance for doubtful accounts | $ 1,114,814us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,079,288us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Shareholders' equity |  |
Common stock, par value (in dollars per share) | $ 1us-gaap_CommonStockParOrStatedValuePerShare | $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) | 12,000,000us-gaap_CommonStockSharesAuthorized | 12,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) | 10,300,000us-gaap_CommonStockSharesIssued | 10,300,000us-gaap_CommonStockSharesIssued
Common stock in treasury, at cost (in shares) | 1,589,698us-gaap_TreasuryStockShares | 1,612,200us-gaap_TreasuryStockShares

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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