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Long-Term Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long-Term Debt    
Amount outstanding under the credit facility $ 10,760,000us-gaap_LongTermLineOfCredit $ 14,820,000us-gaap_LongTermLineOfCredit
Line of Credit    
Long-Term Debt    
Maximum borrowing capacity under the credit facility 35,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Amount outstanding under the credit facility 10,760,000us-gaap_LongTermLineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Interest rate at the end of the period (as a percent) 1.66%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Reference rate LIBOR  
Interest rate added to the reference rate (as a percent) 150.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Remaining maximum borrowings available pursuant to the credit facility $ 5,938,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Line of Credit | Minimum    
Long-Term Debt    
Interest rate added to the reference rate (as a percent) 125.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Interest rate added to the reference rate, if the entity entered into the negative pledge (as a percent) 150.00%dvd_DebtInstrumentBasisSpreadOnVariableRateIfEntityEnteredIntoNegativePledge
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Line of Credit | Maximum    
Long-Term Debt    
Interest rate added to the reference rate (as a percent) 175.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Interest rate added to the reference rate, if the entity entered into the negative pledge (as a percent) 200.00%dvd_DebtInstrumentBasisSpreadOnVariableRateIfEntityEnteredIntoNegativePledge
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember