v2.4.1.9

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 31, 2012
Schedule Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable	$ 18,500us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 15,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Periodic installments of principal and interest	24 months
Allowance for doubtful loans and leases receivable	91,640us-gaap_LoansAndLeasesReceivableAllowance	201,960us-gaap_LoansAndLeasesReceivableAllowance	329,500us-gaap_LoansAndLeasesReceivableAllowance
Definite-lived intangible assets	0us-gaap_FiniteLivedIntangibleAssetsNet	0us-gaap_FiniteLivedIntangibleAssetsNet
Advertising costs	64,025us-gaap_AdvertisingExpense	43,446us-gaap_AdvertisingExpense
Company dilutive common stock equivalent shares	0dvly_DilutiveCommonStockOutstanding	0dvly_DilutiveCommonStockOutstanding
Sales Revenue, Net [Member] | Customer One [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of sales accounted to total revenue	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = dvly_CustomerOneMember	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = dvly_CustomerOneMember
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Insured amount by the federal deposit insurance corporation	$ 250,000us-gaap_CashFDICInsuredAmount / us-gaap_RangeAxis = us-gaap_MaximumMember
Estimated useful life of property, plant and equipment	40 years
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful life of property, plant and equipment	5 years

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

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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.

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-Publisher SEC

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-Section 02

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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