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Deferred Tax Assets (Liabilities) (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Schedule Of Deferred Tax Assets [Line Items] |  |  |
Reserves on inventory and sales | $ 291,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | $ 332,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | $ 336,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Credit and loss carryforwards | 699,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 413,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 692,000 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Stock compensation | 1,283,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 896,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses and deferred costs | 3,170,000 med_DeferredTaxLiabilityAccruedExpensesAndDeferredCosts | 1,260,000 med_DeferredTaxLiabilityAccruedExpensesAndDeferredCosts | 690,000 med_DeferredTaxLiabilityAccruedExpensesAndDeferredCosts
Inventory capitalization | 142,000 us-gaap_DeferredTaxAssetsInventory | 337,000 us-gaap_DeferredTaxAssetsInventory | 526,000 us-gaap_DeferredTaxAssetsInventory
Sales tax accrual | 8,000 med_DeferredTaxAssetsSalesTaxAccrual | 337,000 med_DeferredTaxAssetsSalesTaxAccrual | 1,228,000 med_DeferredTaxAssetsSalesTaxAccrual
Total deferred tax assets | 5,593,000 us-gaap_DeferredTaxAssetsGross | 3,575,000 us-gaap_DeferredTaxAssetsGross | 3,472,000 us-gaap_DeferredTaxAssetsGross
Unrealized gain/loss on investments | (294,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities | (476,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities | (333,000)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Prepaid expenses | (779,000)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (710,000)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (752,000)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Depreciation | (6,285,000)med_DeferredTaxLiabilitiesDepreciations | (7,091,000)med_DeferredTaxLiabilitiesDepreciations | (7,729,000)med_DeferredTaxLiabilitiesDepreciations
Stock compensation | 0 med_DeferredTaxLiabilityTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 0 med_DeferredTaxLiabilityTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | (105,000)med_DeferredTaxLiabilityTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Total deferred tax liabilities | (7,358,000)us-gaap_DeferredIncomeTaxLiabilities | (8,277,000)us-gaap_DeferredIncomeTaxLiabilities | (8,919,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities | $ (1,765,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | $ (4,702,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | $ (5,447,000)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent

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- Definition Deferred tax liability accrued expenses and deferred costs + References No definition available. + Details
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- Definition Amount of deferred tax liabilities attributable to deductible temporary differences from share-based compensation. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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