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Amortization expense (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Expected Amortization Expense [Line Items]
Amortization expense	$ 132,000	$ 107,000
Customer lists
Expected Amortization Expense [Line Items]
Amortization expense	7,000	20,000
Trademarks, patents and copyrights
Expected Amortization Expense [Line Items]
Amortization expense	$ 125,000	$ 87,000

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- Details

Name:	med_ExpectedAmortizationExpenseLineItems
Namespace Prefix:	med_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

+ References

No definition available.

+ Details

Name:	us-gaap_AmortizationOfAcquiredIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration