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Accrued Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities
Payroll and related items	$ 446,000dvd_PayrollAndRelatedItemsCurrent	$ 436,000dvd_PayrollAndRelatedItemsCurrent
Real estate taxes	995,000	984,000
Pension	897,000	729,000
Non-refundable deposit received on expected sale of facility	1,700,000
Other	906,000us-gaap_OtherAccruedLiabilitiesCurrent	738,000us-gaap_OtherAccruedLiabilitiesCurrent
Total	$ 4,944,000us-gaap_AccruedLiabilitiesCurrent	$ 2,887,000us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

This represents the current liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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