Debt (Details) (USD $)	12 Months Ended
Dec. 31, 2012
Debt [Abstract]
Borrowing availability	$ 20,000,000
Interest rate spread (in hundredths)	1.68%
Bank's prime lending rate (in hundredths)	3.25%
Maximum borrowing availability	30,000,000
Expiration date	Jun. 01, 2014
Outstanding balance on line of credit	0
Weighted average interest rate (in hundredths)	1.31%
Mortgage	1,200,000
Annual mortgage payment	207,000
Fixed interest percentage rate (in hundredths)	4.05%
Maturity date	Nov. 01, 2019
Future principal payments under its term loan and mortgage
2013	159,000
2014	166,000
2015	160,000
2016	180,000
2017	187,000
Thereafter	391,000
Total	$ 1,243,000

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments including both interest and principal payments.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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No definition available.

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Amount borrowed under the credit facility as of the balance sheet date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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