Consolidated Statements of Cash Flows (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities:
Net income	$ 6,902,531	$ 6,425,876	$ 11,832,985
Adjustments to reconcile net income to net cash from operating activities:
Depreciation	3,441,281	3,412,891	2,921,624
Amortization and write-off of debt issuance costs	304,920us-gaap_AmortizationOfFinancingCosts	282,129us-gaap_AmortizationOfFinancingCosts	392,518us-gaap_AmortizationOfFinancingCosts
Provision for losses on doubtful receivables	6,880us-gaap_ProvisionForDoubtfulAccounts	62,618us-gaap_ProvisionForDoubtfulAccounts	30,034us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	1,530,367us-gaap_DeferredIncomeTaxExpenseBenefit	1,059,169us-gaap_DeferredIncomeTaxExpenseBenefit	(825,451)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	488,277us-gaap_ShareBasedCompensation	402,363us-gaap_ShareBasedCompensation	294,195us-gaap_ShareBasedCompensation
Gain on sale of discontinued operations	(127,994)
(Gain) loss on sale of property, plant and equipment, net	153,236	(289,632)	(353,007)
Changes in operating assets and liabilities
Accounts receivable	3,718,386	(2,904,202)	3,228,527
Inventories	5,727,237us-gaap_IncreaseDecreaseInInventories	(187,324)us-gaap_IncreaseDecreaseInInventories	5,825,931us-gaap_IncreaseDecreaseInInventories
Other current assets	(2,984,124)	(131,485)	574,922
Trade accounts payable	(6,930,928)	3,952,411	(9,487,890)
Other current liabilities	(2,688,508)	1,377,903	(2,005,044)
Net cash from operating activities	9,541,561	13,462,717	12,429,344
Cash flows from investing activities:
Proceeds from sale of discontinued operations	3,884,656
Proceeds from sale of property, plant, and equipment	830,451	1,268,167	4,239,153
Additions to property, plant and equipment	(4,730,958)	(6,237,152)	(13,159,255)
Proceeds from sale of investments	3,175,591	0	0
Purchases of investments	(4,289,298)us-gaap_PaymentsToAcquireInvestments	(27,338)us-gaap_PaymentsToAcquireInvestments	(1,963,156)us-gaap_PaymentsToAcquireInvestments
Decrease in other assets		25,736	29,878
Net cash from investing activities	(1,129,558)	(4,970,587)	(10,853,380)
Cash flows from financing activities:
Proceeds from revolving line of credit and other long-term debt		63,374,736	295,080,663
Repayments of revolving line of credit and other long-term debt	(666,668)us-gaap_RepaymentsOfLongTermDebt	(67,814,067)us-gaap_RepaymentsOfLongTermDebt	(296,428,325)us-gaap_RepaymentsOfLongTermDebt
Payments of cash dividends	(413,326)us-gaap_PaymentsOfDividendsCommonStock
Debt issuance costs		(358,975)us-gaap_PaymentsOfDebtIssuanceCosts	(376,488)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from exercise of stock options	410,702	141,397	100,409
Net cash from financing activities	(669,292)	(4,656,909)	(1,623,741)
Change in cash and cash equivalents	7,742,711	3,835,221	(47,777)
Cash and cash equivalents, beginning of year	3,894,277	59,056	106,833
Cash and cash equivalents, end of year	11,636,988	3,894,277	59,056
Cash paid during the year for:
Interest, net	247,178us-gaap_InterestPaid	305,895us-gaap_InterestPaid	792,810us-gaap_InterestPaid
Income taxes, net	$ 1,652,889us-gaap_IncomeTaxesPaid	$ 2,072,401us-gaap_IncomeTaxesPaid	$ 1,264,905us-gaap_IncomeTaxesPaid

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